JAIST Sustainable Innovation Area OHDAIRA Lab.

2021

"Hydrogenation on tunnel nitride passivated contacts by catalytically generated atomic hydrogen"
Y. Wen, H. T. C. Tu, and K. Ohdaira
Extended Abstract of the 2021 International Conference on Solid State Devices and Materials (SSDM 2021), F5-03, 2021

"Effect of temperature and pre-annealing on the potential-induced degradation of silicon heterojunction photovoltaic modules"
J. Xu, H. T. C. Tu, A. Masuda, and K. Ohdaira
Extended Abstract of the 2021 International Conference on Solid State Devices and Materials (SSDM 2021), F-5-02, 2021

"Silicon heterojunction solar cells with a counter-doped n-a-Si film treated by flash lamp annealing"
Y. Liu, H. T. C. Tu, N. Yamaguchi, and K. Ohdaira
Extended Abstract of the 2021 International Conference on Solid State Devices and Materials (SSDM 2021), F5-05, 2021

2020

"Tunnel nitride passivated contacts for silicon solar cells formed by Cat-CVD"
Y. Wen, Huynh Thi Cam Tu, and K. Ohdaira
Extended Abstract of the 2020 International Conference on Solid State Devices and Materials (SSDM 2020), F-10-03, 2020

"Influence of light illumination on the potential-induced degradation of n-type interdigitated back-contact crystalline Si photovoltaic modules"
Y. Xu, A. Masuda, and K. Ohdaira
Extended Abstract of the 2020 International Conference on Solid State Devices and Materials (SSDM 2020), F-10-05, 2020

2019

"Potential-induced degradation of n-type front-emitter crystalline silicon photovoltaic modules with different degradation stages"
K. Ohdaira, Y. Komatsu, T. Suzuki, S. Yamaguchi, A. Masuda
Proc. 36th European Photovoltaic Solar Energy Conference and Exhibition, pp. 822–824, 2019.
Proceedings Page

"Control of texture size on as-cut crystalline silicon by microparticle-assisted texturing (MPAT) process"
Cong Thanh Nguyen, K. Ohdaira, and H. Matsumura
Proc. 46th IEEE Photovoltaic Specialists Conference, pp. 795–798, 2019.
Proceedings Page

"Influence of UV light on the increase of SiN_x conductivity toward elucidation of potential induced degradation mechanism"
Dong Chung Nguyen, Y. Ishikawa, Cong Thanh Nguyen, K. Ohdaira, A. Masuda, and Y. Uraoka
Proc. 46th IEEE Photovoltaic Specialists Conference, pp. 317–320, 2019.
Proceedings Page

2018

"Passivation of crystalline silicon surfaces with ultra-thin silicon nitride films formed by catalytic chemical vapor deposition"
H. Song, and K. Ohdaira
Proc. 35th European Photovoltaic Solar Energy Conference and Exhibition, pp.621–623, 2018
Journal Page

"Vacuum deposition of CsPbI3 layers on textured Si for perovskite/Si tandem solar cells"
K. Hamada, K. Yonezawa, K. Yamamoto, T. Taima, S. Hayase, N. Ooyagi, Y. Yamamoto, and K. Ohdaira
Extended Abstract of the 2018 International Conference on Solid State Devices and Materials (SSDM 2018), pp.1041–1042, 2018

"Crystallization of electron-beam evaporated a-Si films on textured glass substrates by flash lamp annealing"
K. Kurata and K. Ohdaira
Extended Abstract of the 2018 International Conference on Solid State Devices and Materials (SSDM 2018), pp.1053–1054, 2018

"Silicon heterojunction solar cell with a p-type amorphous silicon emitter formed by catalytic impurity doping"
K. Akiyama and K. Ohdaira
Proc. 7th World Conference on Photovoltaic Energy Conversion, pp. 2097–2099, 2019
Proceedings Page

"Low cost fabrication of back contact crystalline-silicon heterojunction solar cells with n-a-Si layers partially converted from p-a-Si by Phosphine (PH₃) plasma ion-implantation"
Huynh Thi Cam Tu, K. Koyama, N. Yamaguchi, H. Suzuki, K. Ohdaira, and H. Matsumura
Proc. 7th World Conference on Photovoltaic Energy Conversion, pp. 2021–2023, 2019
Proceedings Page

"Performance of silicon heterojunction solar cells with various metal-electrodes directly formed on a-Si films without insertion of TCO"
T. Konishi, K. Koyama, K. Ohdaira, and H. Matsumura
Proc. 7th World Conference on Photovoltaic Energy Conversion, pp. 2036–2038, 2019
Proceedings Page

2017

"ITO sputtering damage to silicon heterojunction solar cells with Cat-CVD a-Si films and its recovery"
T. Konishi and K. Ohdaira
Proc. 33rd European Photovoltaic Solar Energy Conference and Exhibition, pp. 757–759, 2017
Proceedings Page

"Low-cost fabrication of patterned electrodes in hetero-junction back-contact silicon solar cells by plasma ion-implantation"
K. Koyama, K. Ohdaira, and H. Matsumura
Proc. 33rd European Photovoltaic Solar Energy Conference and Exhibition, pp. 729–731, 2017
Proceedings Page

"Effect of starting point formation on the crystallization of amorphous silicon films by flash lamp annealing"
D. Sato and K. Ohdaira
Extended Abstract of the 2017 International Conference on Solid State Devices and Materials (SSDM2017), C-1-03, 2017

"Potential-induced degradation of a Si nitride/crystalline Si interface observed through minority carrier lifetime measurement"
N. Nishikawa, S. Yamaguchi, K. Ohdaira
Proc. 44th IEEE Photovoltaic Specialists Conference, pp. 1385–1388, 2017
Proceedings Page

"Entrance of low cost fabrication of back-contact hetero-junction solar cells by using plasma ion-implantation"
K. Koyama, K. Ohdaira, and H. Matsumura
Proc. 44th IEEE Photovoltaic Specialists Conference, pp. 1787–1789, 2017
Proceedings Page

2016

"Effect of anti-reflection coating on the crystallization of amorphous silicon films by flash lamp annealing"
Y. Sonoda and K. Ohdaira
Extended Abstract of the 2016 International Conference on Solid State Devices and Materials (SSDM2016), G-6-01, 2016

"Si heterojunction solar cells with a-Si passivation films formed from liquid Si"
K. Ohdaira, C. Guo, H. Takagishi, T. Masuda, Z. Shen, and T. Shimoda
Proc. 43rd IEEE Photovoltaic Specialists Conference, pp. 694–697, 2016
Proceedings Page

"Potential-Induced Degradation Behavior of n-Type Single-Crystalline Silicon Photovoltaic Modules with a Rear-Side Emitter"
S. Yamaguchi, A. Masuda, and K. Ohdaira
Proc. 43rd IEEE Photovoltaic Specialists Conference, pp. 938–942, 2016
Proceedings Page

"Cat-CVD Passivation Realizing Extremely Low Surface Recombination Velocity < 0.2 cm/s in Solar Cell Structure"
Cong T. Nguyen, K. Koyama, S. Terashima, C. Okamoto, S. Sugiyama, K. Ohdaira, and H. Matsumura
Proc. 43rd IEEE Photovoltaic Specialists Conference, pp. 1169–1272, 2016
Proceedings Page

2015

"Formation of Thermally Stable a-Si Passivation Films using Liquid Si"
C. Guo, K. Ohdaira, H. Takagishi, and T. Shimoda
Extended Abstract of the 2015 International Conference on Solid State Devices and Materials (SSDM2015), C-7-1, 2015

"Catalytic Doping of Phosphorus and Boron Atoms onto Hydrogenated Amorphous Silicon Films"
J. Seto, K. Ohdaira, H. Matsumura
Extended Abstract of the 2015 International Conference on Solid State Devices and Materials (SSDM2015), C-7-5, 2015

"Behavior of the Potential-Induced Degradation for Photovoltaic Modules Fabricated using Flat Mono-Crystalline Silicon Cells with Different Surface Orientations"
S. Yamaguchi, A. Masuda, and K. Ohdaira
Extended Abstract of the 2015 International Conference on Solid State Devices and Materials (SSDM2015), PS-15-18L, 2015

"Photo-Carrier Generation at a-Si Layer in SiN_x/a-Si Stacked Passivation with Extremely Low Surface Recombination Velocity"
K. Koyama, K. Higashimine, K. Ohdaira, and H. Matsumura
Proc. 42nd IEEE Photovoltaic Specialists Conference, 2015
Proceedings Page

2014

"Application of c-Si surface oxidation to a-Si/c-Si heterojunction solar cells"
T. Oikawa, K. Ohdaira, and H. Matsumura
Technical Digest of the 6th World Conference on Photovoltaic Energy Conversion (WCPEC-6), pp. 619–620 (2014).

"The formation of thin poly-Si films on textured TCO by flash lamp annealing"
T. Watanabe and K. Ohdaira
Technical Digest of the 6th World Conference on Photovoltaic Energy Conversion (WCPEC-6), pp. 75–76 (2014).

"Passivation quality of Cat-CVD SiNx and SiNx/P Cat-doped layers on textured c-Si wafers"
Trinh Cham Thi, K. Koyama, K. Ohdaira, and H. Matsumura
Technical Digest of the 6th World Conference on Photovoltaic Energy Conversion (WCPEC-6), pp. 613–614 (2014).

"Activation of Cat-Doped Phosphorus Atoms by Flash Lamp Annealing"
K. Ohdaira, Trinh Cham Thi, S. Tsuzaki, and H. Matsumura
Technical Digest of the 6th World Conference on Photovoltaic Energy Conversion (WCPEC-6), pp. 529–530 (2014).

"A Novel Low Temperature Doping Technology, Cat-Doping, and Its Application to Solar Cells"
H. Matsumura, S. Tsuzaki, Trinh Thi Cham, K. Koyama, and K. Ohdaira
Technical Digest of the 6th World Conference on Photovoltaic Energy Conversion (WCPEC-6), pp. 665–666 (2014).

"Application of Heterojunction to Si-based Solar Cells Using Photonic Nanostructures Coupled with Vertically Aligned Ge Quantum Dots"
I. Takahashi, Y. Hoshi, T. Tayagaki, T. Oikawa, K.Ohdaira, and N. Usami
Technical Digest of the 6th World Conference on Photovoltaic Energy Conversion (WCPEC-6), pp. 61–62 (2014).

"Potential-Induced Degradation of Cu(In,Ga)Se2 Photovoltaic Modules"
S. Yamaguchi, K. Hara, H. Komaki, Y. Shimizu-Kamikawa, H. Shibata, S. Niki, Y. Kawakami, and A. Masuda
Technical Digest of the 6th World Conference on Photovoltaic Energy Conversion (WCPEC-6), pp. 339–340 (2014).

"Application of Catalytic Phosphorus Doping to a-Si/c-Si Heterojunction Solar Cells"
S. Tsuzaki, K. Ohdaira, T. Oikawa, K. Koyama, and H. Matsumura
Proc. 29th European Photovoltaic Solar Energy Conference and Exhibition, pp. 969–972 (2014).
Proceedings Page

"Requirements for Achieving Extremely Low Surface Recombination Velocity and Negligible Optical Loss in Cat-CVD SiN_x/a-Si Stacked Passivation"
K. Koyama, Trinh Cham Thi, K. Higashimine, K. Ohdaira, and H. Matsumura
Proc. 39th IEEE Photovoltaic Specialists Conference, pp. 3304–3307 (2014).
Proceedings Page

2013

"Extremely Low Surface Recombination Velocity of Crystalline Silicon Realized by Low Temperature Phosphorus Cat-Doping and Successive Deposition of Cat-CVD Silicon-Nitride Films"
Trinh Cham Thi, K. Koyama, K. Ohdaira, and H. Matsumura
Technical Digest of the 23rd International Photovoltaic Science and Engineering Conference (PVSEC-23), 1-O-24, 2013.

"Application of Cat-CVD SiNx/a-Si Stacked Passivation Films to Crystalline Si Solar Cells"
S. Tsuzaki, K. Koyama, K. Ohdaira, and H. Matsumura
Technical Digest of the 23rd International Photovoltaic Science and Engineering Conference (PVSEC-23), 1-O-27, 2013.

"The use of toughened glass substrates for the formation of polycrystalline silicon films by flash lamp annealing"
K. Ohdaira
Technical Digest of the 23rd International Photovoltaic Science and Engineering Conference (PVSEC-23), 2-O-10, 2013.

"Stability of Cat-CVD Silicon-Nitride/Amorphous-Silicon Stacked Passivation System Realizing Extremely Low Surface Recombination Velocity"
K. Koyama, K. Ohdaira, and H. Matsumura
Technical Digest of the 23rd International Photovoltaic Science and Engineering Conference (PVSEC-23), 1-O-15, 2013.

"10-µm-Thick Polycrystalline Silicon Films Formed by Flash Lamp Annealing"
K. Ohdaira
Proceedings of the 28th European Photovoltaic Energy conference and Exhibition, pp. 2671–2674, 2013.
Proceedings Page

"Effect of Annealing on the Vertical Structural Distribution of Solution-Processed a-Si:H Films"
Y. Sakuma, K. Ohdaira, T. Masuda, H. Takagishi, Z. Shen, and T. Shimoda
Extended Abstract of the 2013 International Conference on Solid State Devices and Materials (SSDM2013), 2013

2012

"Study of the relationship between a gas-barrier property and the residual stress of films made by a Cat-CVD method"
T. Tsutsumi, H. Yanagihara, H. Amanai, S. Yoshida, Y. Watanabe, K. Ohdaira, and H. Matsumura
Annual Technical Conference Proceedings - Society of Vacuum Coaters, 55th, 481.

"Photovoltaic effect of large-grain polycrystalline silicon films formed by flash lamp annealing"
K. Ohdaira and S. Varlamov
Technical Digest of the 22nd International Photovoltaic Science and Engineering Conference, P-2-25.

"Surface Passivation on Crystalline Silicon with Low Optical Reflectivity and Low Surface Recombination Velocity"
H. Matsumura, K. Katoh, K. Koyama, K. Ohdaira
Technical Digest of the 22nd International Photovoltaic Science and Engineering Conference, P-1-24.

"Study on Stability of SiN_x/a-Si Stacked Passivation Layer Realizing Extremely Low Surface Recombination Velocity"
T. Goto, K. Koyama, K. Ohdaira, and H. Matsumura
Technical Digest of the 22nd International Photovoltaic Science and Engineering Conference, O-1-27.

"Low Temperature Doping of P and B atoms into Crystalline Si by Catalytically Generated Species from PH₃ and B₂H₆"
T. Ohta, K. Koyama, K. Ohdaira, and H. Matsumura
Technical Digest of the 22nd International Photovoltaic Science and Engineering Conference, P-1-40.

"Study on Light-Soaking Degradation and Damp Heat Tests for Cat-CVD SiN_x/a-Si Stacked Passivation Films Realizing Extremely Low Surface Recombination Velocity"
K. Koyama, T. Goto, K. Ohdaira, and H. Matsumura
Proc. 27th European Photovoltaic Solar Energy Conference and Exhibition, pp. 2007-2009, 2012.
Proceedings page

"Defect Termination of Flash-Lamp-Crystallized Large-Grain Polycrystalline Silicon Films by High-Pressure Water Vapor Annealing"
K. Ohdaira
Ext. Abst. 2012 Int'l Conf. Solid State Devices and Mater. p.1009.

"Formation of polycrystalline silicon films with µm-order-long grains through liquid-phase explosive crystallization by flash lamp annealing"
K. Ohdaira, S. Varlamov, N. Usami, and H. Matsumura
Proc. 38th IEEE Photovoltaic Specialists Conference, pp. 1225–1228, 2012.
Proceedings Page

"Pixel Controlling Substrate Fabricated by Embedding Millions of Silicon IC Chips on Plastic Substrate and Self-Aligned Metal Interconnection Among Such IC Chips"
N. T. T. Kieu, T. Yagi, K. Ohdaira, and H. Matsumura
Technical Digest of SID International Symposium, Seminar, and Exhibition, 2012.

2024

"Current situation of PV in Japan" (invited)
Keisuke Ohdaira
4th Asian Nations Joint Workshop on Photovoltaics（Plaza Verde, Numazu）, November 14, 2024

"Damp heat stability of Cat-CVD Si nitride films deposited at a high deposition rate"
Keisuke Ohdaira, Huynh Thi Cam Tu
35th International Photovoltaic Science and Engineering Conference (PVSEC-35) (Plaza Verde, Numazu）, November 10-15, 2024

"Bayesian optimization of deposition condition of Cat-CVD n-a-Si:H film"
Ryota Ohashi, Kentaro Kutsukake, Huynh Thi Cam Tu, Keisuke Ohdaira
35th International Photovoltaic Science and Engineering Conference (PVSEC-35) (Plaza Verde, Numazu）, November 10-15, 2024

"Silicon solar cells using n-type tin oxide as a hole selective layer"
Huynh Thi Cam Tu, Keisuke Ohdaira
35th International Photovoltaic Science and Engineering Conference (PVSEC-35) (Plaza Verde, Numazu）, November 10-15, 2024

"Minority carrier lifetime in CH₃NH₃PbI₃ perovskite films with doped amorphous Si"
Chenxi Li, Huynh Thi Cam Tu, Peng Liu, Md.Shahiduzzaman, Tetsuya Taima, Keisuke Ohdaira
35th International Photovoltaic Science and Engineering Conference (PVSEC-35) (Plaza Verde, Numazu）, November 10-15, 2024

"Passivation quality and contact resistance of tunnel nitride passivated contacts with various silicon nitride compositions"
Yuhi Ito, Huynh Thi Cam Tu, Keisuke Ohdaira
35th International Photovoltaic Science and Engineering Conference (PVSEC-35) (Plaza Verde, Numazu）, November 10-15, 2024

"Mechanical strength evaluation of curved crystalline silicon photovoltaic modules without encapsulant and cover glass"
Mitsunori Nagahara, Huynh Thi Cam Tu, Keisuke Ohdaira
35th International Photovoltaic Science and Engineering Conference (PVSEC-35) (Plaza Verde, Numazu）, November 10-15, 2024

"Crystallization of Cat-CVD amorphous silicon films by FLA on seed crystal layers formed by aluminum induced crystallization"
Baitong Li, Huynh Thi Cam Tu, Keisuke Ohdaira
35th International Photovoltaic Science and Engineering Conference (PVSEC-35) (Plaza Verde, Numazu）, November 10-15, 2024

"Tolerance to potential-induced degradation for crystalline Si photovoltaic modules with Ag nanowires deposited on cell/encapsulant interface"
Asahi Yonemoto, Yiming Qin, Dhamrin Marwan, Keisuse Ohdaira, Kazuhiro Gotoh
35th International Photovoltaic Science and Engineering Conference (PVSEC-35) (Plaza Verde, Numazu）, November 10-15, 2024

"Mitigation of potential-induced degradation phenomena by Li element in crystalline Si photovoltaic modules"
Yiming QIN, Asahi Yonemoto, Dhamrin Marwan, Keisuke Ohdaira, Kazuhiro Gotoh, Atsushi Masuda
35th International Photovoltaic Science and Engineering Conference (PVSEC-35) (Plaza Verde, Numazu）, November 10-15, 2024

"Improvement of heat dissipation of crystalline silicon-based-solar-cell module by MgO particle mixed silicone layer"
Yuta Ninomiya, Eiko Shimokata, Keisuke Ohdaira, Atsushi Masuda, Yasushi Sobajima
35th International Photovoltaic Science and Engineering Conference (PVSEC-35) (Plaza Verde, Numazu）, November 10-15, 2024

"Adding heat dissipation function to c-Si-based solar cell modules without encapsulants using MgO/silicone layer"
Kouzen Wakazono, Shinya Tsukamoto, Keisuke Ohdaira, Yasushi Sobajima
35th International Photovoltaic Science and Engineering Conference (PVSEC-35) (Plaza Verde, Numazu）, November 10-15, 2024

"Influence of aging test on curved crystalline Si photovoltaic unencapsulated modules with polycarbonate base"
Yo Yamakawa, Kazuma Ito, Yasuhiro Okada, Yohei Ogashiwa, Hiroaki Takahashi, Naoshi Kimura, Shuntaro Shimpo, Mitsunori Nagahara, Keisuke Ohdaira, Kazuhiro Gotoh, Atsushi Masuda
35th International Photovoltaic Science and Engineering Conference (PVSEC-35) (Plaza Verde, Numazu）, November 10-15, 2024

"Development of crystalline silicon photovoltaic modules without encapsulant" (invited)
Keisuke Ohdaira
SAYURI-PV 2024（AIST Tsukuba）, November 7-8, 2024

"Development of encapsulant-less crystalline silicon photovoltaic modules and their durability against potential-induced degradation"
Keisuke Ohdaira, Shuntaro Shimpo, Huynh Thi Cam Tu
41st European Photovoltaic Solar Energy Conference (EU PVSEC)（Austria Center Vienna), September 23-27, 2024

"MgO/SiO_x Adds Heat Dissipation Function to Crystalline Silicon Solar Cell Modules"
Eiko Shimokata, Yasushi Sobajima, Keisuke Ohdaira, Atsushi Masuda
41st European Photovoltaic Solar Energy Conference (EU PVSEC)（Austria Center Vienna), September 23-27, 2024

"TiO₂/SiO_x Surface Coating on Crystalline Silicon-Based-Solar Cell Module to Provide Anti-Soiling Functionality"
Koshiro Iwaki, Yasushi Sobajima, Keisuke Ohdaira, Atsushi Masuda
41st European Photovoltaic Solar Energy Conference (EU PVSEC)（Austria Center Vienna), September 23-27, 2024

"Catalytic chemical vapor deposition for crystalline silicon solar cells"(invited)
Keisuke Ohdaira
31st International Workshop on Active-Matrix Flatpanel Displays And Devices(AM-FPD24)(Ryukoku University), July 2-5, 2024

2023

"Effectiveness of Al-induced charged oxide inversion layer on pyramidal textured Si surfaces"
Hiroki Nakajima, Huynh Thi Cam Tu, Keisuke Ohdaira
34th International Photovoltaic Science and Engineering Conference (PVSEC-34)(Shenzhen World Exhibition & Convention Center), Novemver 6-10, 2023

"Effect of cover glass morphology on the potential-induced degradation of n-type front-emitter crystalline silicon photovoltaic modules"
Keisuke Ohdaira, Tomoyasu Suzuki, Yutaka Komatsu, Seira Yamaguchi, Atsushi Masuda
34th International Photovoltaic Science and Engineering Conference (PVSEC-34)(Shenzhen World Exhibition & Convention Center), Novemver 6-10, 2023

"Surface passivation of polycrystalline Si films formed by FLA to Cat-CVD hydrogenated n-a-Si films for solar cell applications"
Zheng Wang, Huynh Thi Cam Tu, Keisuke Ohdaira
34th International Photovoltaic Science and Engineering Conference (PVSEC-34)(Shenzhen World Exhibition & Convention Center), Novemver 6-10, 2023

"Influence of rotational speed and glass bead amount during etching by MPAT on Si texture size"
Pengyu Yang, Peng Liu, Huynh Thi Cam Tu, Md. Shahiduzzaman, Tetsuya Taima, Keisuke Ohdaira
34th International Photovoltaic Science and Engineering Conference (PVSEC-34)(Shenzhen World Exhibition & Convention Center), Novemver 6-10, 2023

"Improvement in the passivation quality of Cat-CVD i-a-Si by applying Bayesian optimization"
Ryota Ohashi, Kentaro Kutsukake, Huynh Thi Cam Tu, Koichi Higashimine, Keisuke Ohdaira
34th International Photovoltaic Science and Engineering Conference (PVSEC-34)(Shenzhen World Exhibition & Convention Center),Novemver 6-10,2023

"Excellent surface passivation on a pyramidal textured Si surface by wet chemically grown Al-induced charged oxide inversion layer"
Hiroki Nakajima, Huynh Thi Cam Tu, Keisuke Ohdaira
40th European Photovoltaic Solar Energy Conference and Exhibition (Lisbon Congress Centre) September 18-22, 2023

"Long-term stability of Cat-CVD SiN_x protection layer against damp-heat stress"
Huynh Thi Cam Tu and Keisuke Ohdaira
9th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies (EM-NANO 2023) (Ishikawa Industrial Promotion Center) June 5-8, 2023

"Enhancement of diffusion barrier effect of ultra-thin silicon nitride films against P in TNPCon by catalytically generated nitride species"
Yuli Wen, Huynh Thi Cam Tu and Keisuke Ohdaira
9th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies (EM-NANO 2023) (Ishikawa Industrial Promotion Center) June 5-8, 2023

"Delay of the potential-induced degradation of n-type crystalline silicon photovoltaic modules by the prior application of reverse bias"
Deqin Wu, Huynh Thi Cam Tu, and Keisuke Ohdaira
9th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies (EM-NANO 2023) (Ishikawa Industrial Promotion Center) June 5-8, 2023

"Tunnel nitride passivation contacts for crystalline silicon solar cells" (invited)
Keisuke Ohdaira, Yuli Wen, and Huynh Thi Cam Tu
11th International Conference on Hot-Wire Chemical Vapor Deposition (11th HWCVD) (Jülich), April 17-19, 2023

"Application of Cat-CVD SiN_x as a protection layer for improving the stability of perovskite solar cells"
Huynh Thi Cam Tu, Ai Shimazaki, Ryuji Kaneko, Atsushi Wakamiya, Keisuke Ohdaira
11th International Conference on Hot-Wire Chemical Vapor Deposition (11th HWCVD) (Jülich), April 17-19, 2023

"The significant role of an ultrathin SiOx interlayer underneath a Cat-CVD SiNy passivation layer for the high-efficiency n-type crystalline Si solar cells"
Hiroki Nakajima, Huynh Thi Cam Tu, Keisuke Ohdaira
11th International Conference on Hot-Wire Chemical Vapor Deposition (11th HWCVD) (Jülich), April 17-19, 2023

2022

"Ultrathin Al-doped SiO_x passivating hole-selective contacts formed by a simple wet process"
Hiroki Nakajima, Huynh Thi Cam Tu, Keisuke Ohdaira
33rd International Photovoltaic Science and Engineering Conference (PVSEC-33) (Nagoya Congress Center), November 13-17, 2022

"Second-stage potential-induced degradation of n-type front-emitter crystalline silicon photovoltaic modules and its recovery"
Keisuke Ohdaira, Yutaka Komatsu, Seira Yamaguchi, Atsushi Masuda
33rd International Photovoltaic Science and Engineering Conference (PVSEC-33) (Nagoya Congress Center), November 13-17, 2022

"Simple back-contact silicon heterojunction solar cells using polycrystalline silicon formed by FLA on Cat-CVD a-Si:H films"
Zheng Wang, Huynh Thi Cam Tu, Keisuke Ohdaira
33rd International Photovoltaic Science and Engineering Conference (PVSEC-33) (Nagoya Congress Center), November 13-17, 2022

"Potential-induced degradation of encapsulant-less p-type crystalline Si photovoltaic modules"
Shuntaro Shimpo, Huynh Thi Cam Tu, Keisuke Ohdaira
33rd International Photovoltaic Science and Engineering Conference (PVSEC-33) (Nagoya Congress Center), November 13-17, 2022

"Passivating contacts based on directly-nitridated ultra-thin silicon nitride films"
Yuli Wen, Huynh Thi Cam Tu, Keisuke Ohdaira
33rd International Photovoltaic Science and Engineering Conference (PVSEC-33) (Nagoya Congress Center), November 13-17, 2022

"Potential-Induced Degradation of p-type Crystalline Si Cell Modules with a SiN_x Film Formed by Cat-CVD"
Ryoichi Ishikawa, Toshiki Itasaka, Huynh Thi Cam Tu, Tomihisa Tachibana, Keisuke Ohdaira
33rd International Photovoltaic Science and Engineering Conference (PVSEC-33) (Nagoya Congress Center), November 13-17, 2022

"Effect of SiN_x gas barrier films on the protection of perovskite layers"
Wenbo Cao, Peng Liu, Huynh Thi Cam Tu, Md. Shahiduzzaman, Tetsuya Taima, Keisuke Ohdaira
33rd International Photovoltaic Science and Engineering Conference (PVSEC-33) (Nagoya Congress Center), November 13-17, 2022

"Cat-CVD SiN_x for film encapsulation of mixed cation-halide CsFAMAPbIBr perovskite cell structures"
Huynh Thi Cam Tu, Ai Shimazaki, Ryuji Kaneko, Atsushi Wakamiya, Keisuke Ohdaira
33rd International Photovoltaic Science and Engineering Conference (PVSEC-33) (Nagoya Congress Center), November 13-17, 2022

"Novel concept of crystalline Si photovoltaic modules without encapsulation and their hygrothermal and thermal-cycle tolerance"
Nobuhito Imajo, Keisuke Ohdaira, Atsushi Masuda
33rd International Photovoltaic Science and Engineering Conference (PVSEC-33) (Nagoya Congress Center), November 13-17, 2022

"Study on the Inhibition of Temperature Rise by Thermal Conducting Nanoparticles Mixed SiO_x Film in Crystalline Silicon Solar Cell Module without Encapsulant Layer"
Yasushi Sobajima, Keigo Shimizu, Yudai Hasegawa, Yuto Maehara, Shinya Tsukamoto, Keisuke Ohdaira
33rd International Photovoltaic Science and Engineering Conference (PVSEC-33) (Nagoya Congress Center), November 13-17, 2022

"Ion Impurity Measurements in Organic Thin Films on High Voltage Application"
Masaru Inoue, Noriaki Oyabu, Takuro Iwata, Keisuke Ohdaira, and Hideyuki Murata
22nd International Meeting on Information Display (IMID 2022) (Busan, Korea/Online), August 23-26, 2022

"Formation of polycrystalline silicon films on glass substrates by flash lamp annealing of amorphous silicon films" (invited)
Keisuke Ohdaira
The 29th international conference on amorphous and nanocrystalline semiconductors (ICANS 29) (Nanjing, China/Online), August 23-26, 2022

"Hygrothermal-stress induced degradation for novel concept crystalline silicon photovoltaic modules without encapsulants"
N. Imajo, K. Ohdaira, A. Masuda
Global Photovoltaic Conference 2022 (GPVC 2022) (Kimdaejung Convention Center, Gwangju, Korea), July 6-8, 2022

"Carrier selective contacts using ultra-thin oxide and nitride films for crystalline silicon solar cells" (invited)
K. Ohdaira, Y. Wen, H. Nakajima, and H. T. C. Tu
The 8th Korea-Japan Joint Seminar on PV (Jeju, Korea/Online), May 26-28, 2022

"Two-terminal perovskite/silicon heterojunction tandem solar cells" (invited)
A. Masuda, R. Kaneko, A. Wakamiya, K. Ohdaira, D. C. Nguyen, Y. Ishikawa, A. Ogura, K. Nakamura, and Y. Ohshita
The 8th Korea-Japan Joint Seminar on PV (Jeju, Korea/Online), May 26-28, 2022

"Effect of double-layer antireflection coating on photon current density of two-terminal perovskite/silicon tandem cells"
D. C. Nguyen, R. Kaneko, A. Wakamiya, K. Ohdaira, A. Masuda, and Y. Ishikawa
The 8th Korea-Japan Joint Seminar on PV (Jeju, Korea/Online), May 26-28, 2022

"Detection of ion impurities in organic thin films by displacement current measurement method"
T. Iwata, M. Inoue, N. Oyabu, K. Ohdaira, and H. Murata
SID Display Week 2022 (San Jose, USA), May 10-12, 2022

2021

"Passivation for crystalline silicon in passivation contacts by catalytically generated hydrogen"
Y. Wen, H. T. C. Tu, and K. Ohdaira
The 31st International PV Science and Engineering Conference (PVSEC-31), December 13-15, 2021

"Formation of n-poly-Si films on textured glass substrates by the flash lamp annealing of hydrogenated n-a-Si films"
Z. Wang, H. T. C. Tu, and K. Ohdaira
The 31st International PV Science and Engineering Conference (PVSEC-31), December 13-15, 2021

"Cat-CVD SiN_x / ultrathin SiO_x passivation stacks for high-efficiency crystalline Si solar cells"
H. Nakajima, H. T. C. Tu, and K. Ohdaira
The 31st International PV Science and Engineering Conference (PVSEC-31), December 13-15, 2021

"Silicon heterojunction solar cells with a counter-doped n-a-Si film treated by flash lamp annealing"
Y. Liu, H. T. C. Tu, N. Yamaguchi, and K. Ohdaira
The 31st International PV Science and Engineering Conference (PVSEC-31), December 13-15, 2021

"Fire-through Ag contact formation for c-Si solar cells with Cat-CVD SiN_x"
T. Itasaka, T. Tachibana, H. T. C. Tu, and K. Ohdaira
The 31st International PV Science and Engineering Conference (PVSEC-31), December 13-15, 2021

"Simulation of perovskite solar cells with doped a-Si as a carrier transport layer"
K. Liu, H. T. C. Tu, and K. Ohdaira
The 31st International PV Science and Engineering Conference (PVSEC-31), December 13-15, 2021

"Effect of prior reverse bias application on the potential-induced degradation of n-type front-emitter crystalline Si photovoltaic modules"
D. Wu, H. T. C. Tu, and K. Ohdaira
The 31st International PV Science and Engineering Conference (PVSEC-31), December 13-15, 2021

"Defect reduction in polycrystalline silicon films formed by flash lamp annealing"
Y. Yanagi, Z. Wang, H. T. C. Tu, and K. Ohdaira
The 31st International PV Science and Engineering Conference (PVSEC-31), December 13-15, 2021

"Enhancement of ferroelectricity in sputtered hafnium-zirconium oxide thin films by catalytically generated atomic hydrogen treatment"
Mohit, Y. Wen, Y. Hara, S. Migita, H. Ota, Y. Morita, K. Ohdaira, and E. Tokumitsu
2021 International Workshop on DIELECTRIC THIN FILMS FOR FUTURE ELECTRON DEVICES: SCIENCE AND TECHNOLOGY, November 14-16, 2021

"Hydrogenation on tunnel nitride passivated contacts by catalytically generated atomic hydrogen"
Y. Wen, H. T. C. Tu, and K. Ohdaira
2021 International Conference on Solid State Devices and Materials (SSDM 2021), September 6-9, 2021

"Effect of temperature and pre-annealing on the potential-induced degradation of silicon heterojunction photovoltaic modules"
J. Xu, H. T. C. Tu, A. Masuda, and K. Ohdaira
2021 International Conference on Solid State Devices and Materials (SSDM 2021), September 6-9, 2021

"Silicon heterojunction solar cells with a counter-doped n-a-Si film treated by flash lamp annealing"
Y. Liu, H. T. C. Tu, N. Yamaguchi, and K. Ohdaira
2021 International Conference on Solid State Devices and Materials (SSDM 2021), September 6-9, 2021

"Use of n-type amorphous Si films for the electron transport layer of perovskite solar cells"
Z. Song, Y. Sumai, S. Fukaya, H. T. C. Tu, Md. Shahiduzzaman, T. Taima, and K. Ohdaira
The 8th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies (EM-NANO 2021), June 1-3, 2021

"Influence of light irradiation on the charge-accumulation-type potential-induced degradation of n-type front-emitter crystalline silicon photovoltaic modules"
R. Zhao, H. T. C. Tu, A. Masuda, and K. Ohdaira
The 8th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies (EM-NANO 2021), June 1-3, 2021

"Crystallization of catalytic CVD hydrogenated n-type amorphous silicon films on textured glass substrates by flash lamp annealing"
Z. Wang, H. T. C. Tu, and K. Ohdaira
The 8th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies (EM-NANO 2021), June 1-3, 2021

2020

"Passivation properties of a-Si after plasma ion implantion through a hard mask”
Huynh Thi Cam Tu, N. Yamaguchi, and K. Ohdaira
The 30th International PV Science and Engineering Conference (PVSEC-30), November 8-13, 2020

"Cat-CVD tunneling nitride passivated contact for crystalline silicon solar cells”
Y. Wen, Huynh Thi Cam Tu, and K. Ohdaira
The 30th International PV Science and Engineering Conference (PVSEC-30), November 8-13, 2020

"Perovskite solar cell using n-type amorphous Si as an electron transport layer”
Z. Song, Y. Sumai, S. Fukaya, Huynh Tu Thi Cam, Md. Shahiduzzaman, T. Taima, and K. Ohdaira
The 30th International PV Science and Engineering Conference (PVSEC-30), November 8-13, 2020

"Effect of temperature on the potential-induced degradation of silicon heterojunction photovoltaic modules”
J. Xu, A. Masuda, and K. Ohdaira
The 30th International PV Science and Engineering Conference (PVSEC-30), November 8-13, 2020

"Passivation of crystalline Si surfaces by stacked amorphous Si films formed by Cat-CVD”
Y. Terakado, Huynh Thi Cam Tu, and K. Ohdaira
The 30th International PV Science and Engineering Conference (PVSEC-30), November 8-13, 2020

"Formation of poly-Si films on textured glass substrates by the flash lamp annealing of hydrogenated amorphous Si films”
Z. Wang, Huynh Thi Cam Tu, and K. Ohdaira
The 30th International PV Science and Engineering Conference (PVSEC-30), November 8-13, 2020

"Effect of light irradiation on the PID of n-type front-emitter crystalline Si photovoltaic modules with SiN_x with different refractive indexes”
R. Zhao, A. Masuda, and K. Ohdaira
The 30th International PV Science and Engineering Conference (PVSEC-30), November 8-13, 2020

"Potential-induced degradation of silicon heterojunction photovoltaic modules" (invited)
K. Ohdaira, S. Yamaguchi, and A. Masuda
3rd International Workshop on Silicon Heterojunction Solar Cells: Science and Industry Technology, October 19-21, 2020

"Tunnel nitride passivated contacts for silicon solar cells formed by Cat-CVD"
Y. Wen, Huynh Thi Cam Tu, and K. Ohdaira
2020 International Conference on Solid State Devices and Materials (SSDM 2020), September 27-30, 2020

"Influence of light illumination on the potential-induced degradation of n-type interdigitated back-contact crystalline Si photovoltaic modules"
Y. Xu, A. Masuda, and K. Ohdaira
2020 International Conference on Solid State Devices and Materials (SSDM 2020), September 27-30, 2020

2019

"Microparticle-assisted texturing (MPAT) process on as-cut crystalline silicon-controllable texture size, low optical reflectivity, quick formation, extremely low material loss and toward mass-production"
Cong Thanh Nguyen, K. Ohdaira, H. Matsumura
2019 MRS Meeting & Exhibit (Boston, Massachusetts, USA), December 1–6, 2019

"Systematic study on potential-induced degradation of n-type crystalline Si photovoltaic modules"(invited)
K. Ohdaira
The 29th International PV Science and Engineering Conference (PVSEC-29) (Xi'an, China), November 4–8, 2019

"Tunneling conductivity of ultra-thin SiN_x films for TOPCon-like solar cells formed by Cat-CVD"
Y. Wen and K. Ohdaira
The 29th International PV Science and Engineering Conference (PVSEC-29) (Xi'an, China), November 4–8, 2019

"Potential-induced degradation and recovery behaviors of photovoltaic modules with n-type front-emitter crystalline Si cells without SiO₂"
T. Suzuki, S. Yamaguchi, K. Nakamura, A. Masuda, and K. Ohdaira
The 29th International PV Science and Engineering Conference (PVSEC-29) (Xi'an, China), November 4–8, 2019

"Fabrication of SHJ solar cells with p-type a-Si films formed from n-a-Si by B Cat-doping"
T. Tsurugai and K. Ohdaira
The 29th International PV Science and Engineering Conference (PVSEC-29) (Xi'an, China), November 4–8, 2019

"Crystallization of electron-beam-evaporated amorphous Si films on textured glass substrates by FLA"
A. Yago and K. Ohdaira
The 29th International PV Science and Engineering Conference (PVSEC-29) (Xi'an, China), November 4–8, 2019

"Influence of NH₃-related radicals generated in a Cat-CVD apparatus on the passivation quality of SiN_x films"
Y. Sumitomo and K. Ohdaira
The 29th International PV Science and Engineering Conference (PVSEC-29) (Xi'an, China), November 4–8, 2019

"Influence of light illumination on the potential-induced degradation of n-type rear-emitter crystalline Si photovoltaic modules"
Y. Xu, S. Yamaguchi, K. Nakamura, A. Masuda, and K. Ohdaira
The 29th International PV Science and Engineering Conference (PVSEC-29) (Xi'an, China), November 4–8, 2019

"Effect of boron concentration on counter-doping of boron doped amorphous silicon by PH₃ plasma ion implantation"
Huynh Thi Cam Tu, N. Yamaguchi, H. Matsumura, and K. Ohdaira
The 29th International PV Science and Engineering Conference (PVSEC-29) (Xi'an, China), November 4–8, 2019

"Comparison between indoor and outdoor test results on potential-induced degradation behavior for n-type front-emitter crystalline Si photovoltaic modules"
M. Akitomi, Y. Chiba, K. Ohdaira, and A. Masuda
The 29th International PV Science and Engineering Conference (PVSEC-29) (Xi'an, China), November 4–8, 2019

"Potential-induced degradation of n-type front-emitter crystalline silicon photovoltaic modules with different degradation stages"
K. Ohdaira, Y. Komatsu, T. Suzuki, S. Yamaguchi and A. Masuda
36th European Photovoltaic Solar Energy Conference and Exhibition (36th EU PVSEC 2019) (Marseille, France) , September 9–13, 2019

"Thickness dependence of the passivation quality of Cat-CVD SiN_x films"
Y. Wen and K. Ohdaira
The 7th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies (EM-NANO 2019) (Shinshu University, Nagano), June 19–22, 2019

"Effect of a SiO₂ film on the potential-induced degradation of n-type front-emitter c-Si photovoltaic modules"
T. Suzuki, S. Yamaguchi, K. Nakamura, A. Masuda, and K. Ohdaira
The 7th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies (EM-NANO 2019) (Shinshu University, Nagano), June 19–22, 2019

"Utilization of amorphous silicon films for carrier transport layers in MAPbI₃ solar cells"
K. Ohdaira, K. Hamada, D. Kuwabara, T. Taima, K. Yamamoto, and T. Miyadera
The 7th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies (EM-NANO 2019) (Shinshu University, Nagano), June 19–22, 2019

"Influence of hygrothermal stress on potential-induced degradation for homojunction and heterojunction crystalline Si photovoltaic modules"
A. Masuda, C. Yamamoto, Y. Hara, S. Jonai, Y. Tachibana, T. Toyoda, T. Minamikawa, S. Yamaguchi, and K. Ohdaira
The 7th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies (EM-NANO 2019) (Shinshu University, Nagano), June 19–22, 2019

"Control of texture size on as-cut crystalline silicon by microparticle-assisted texturing (MPAT) process"
Cong Thanh Nguyen, K. Ohdaira, and H. Matsumura
The 46th IEEE Photovoltaic Specialists Conference (Sheraton Grand, Chicago, Illinois), June 16–21, 2019

2018

"Formation of counter-doped n-a-Si films with good passivation quality by plasma ion implantation"
Huynh Thi Cam Tu, N. Yamaguchi, H. Suzuki, K. Ohdaira, and H. Matsumura
The 7th Korea-Japan Joint Seminar on PV (Seoul, Korea), November 16–17, 2018

"Extremely low surface recombination velocity of 0.6 cm/s obtained on textured crystalline silicon prepared by microparticle-assisted texturing (MPAT) process for solar cells"
Cong Thanh Nguyen, Huynh Thi Cam Tu, K. Ohdaira, and H. Matsumura　
The 7th Korea-Japan Joint Seminar on PV (Seoul, Korea), November 16–17, 2018

"Performance degradation in front-emitter n-type crystalline silicon photovoltaic modules under long-duration potential-induced degradation tests"
K. Ohdaira, Y. Komatsu, S. Yamaguchi, and A. Masuda
3rd International Workshop on the Sustainable Actions for "Year by Year Aging" under Reliability Investigations in Photovoltaic Modules (SAYURI-PV 2018)(AIST, Tsukuba), October 30–31, 2018

"Effect of light illumination on potential-induced degradation in front-emitter n-type crystalline silicon photovoltaic modules"
S. Yamaguchi, A. Masuda, and K. Ohdaira
3rd International Workshop on the Sustainable Actions for "Year by Year Aging" under Reliability Investigations in Photovoltaic Modules (SAYURI-PV 2018)(AIST, Tsukuba), October 30–31, 2018

"Current and electric field analyses inside photovoltaic module during PID acceleration test"
Y. Tachibana, T. Toyoda, S. Yamaguchi, K. Ohdaira, C. Yamamoto, and A. Masuda
3rd International Workshop on the Sustainable Actions for "Year by Year Aging" under Reliability Investigations in Photovoltaic Modules (SAYURI-PV 2018)(AIST, Tsukuba), October 30–31, 2018

"Passivation of Crystalline Silicon Surfaces with Ultra-Thin Silicon Nitride Films Formed by Catalytic Chemical Vapor Deposition"
H. Song and K. Ohdaira　
35th European Photovoltaic Solar Energy Conference and Exhibition (35th EU PVSEC 2018) (Brussels, Belgium), September 24–28, 2018

"Vacuum deposition of CsPbI₃ layers on textured Si for perovskite/Si tandem solar cells"
K. Hamada, K. Yonezawa, K. Yamamoto, T. Taima, S. Hayase, N. Ooyagi, Y. Yamamoto, and K. Ohdaira
2018 International Conference on Solid State Devices and Materials (SSDM 2018) (The University of Tokyo, Japan), September 9–13, 2018

"Crystallization of electron-beam evaporated a-Si films on textured glass substrates by flash lamp annealing"
K. Kurata and K. Ohdaira
2018 International Conference on Solid State Devices and Materials (SSDM 2018) (The University of Tokyo, Japan), September 9–13, 2018

"Current status of Cat-CVD technology - history of research and current status of industrial implementation -"(invited)
H. Matsumura
10th International Confenrence on Hot Wire (Cat) and Initiated Chemical Vapor Deposition (HWCVD10) (Kitakyushu, Japan), September 3–6, 2018

"A simplest Cat-CVD apparatus without direct substrate heating system"
H. Matsumura, K. Koyama, K. Ogawa, S. Terashima, T. Konishi, T. Baba, Y. Takeuchi, and K. Ohdaira
10th International Confenrence on Hot Wire (Cat) and Initiated Chemical Vapor Deposition (HWCVD10) (Kitakyushu, Japan), September 3–6, 2018

"Conversion of conduction type of Cat-CVD p-type a-Si by ion implantation"
Huynh Thi Cam Tu, K. Koyama, N. Yamaguchi, H. Suzuki, K. Ohdaira, and H. Matsumura
10th International Confenrence on Hot Wire (Cat) and Initiated Chemical Vapor Deposition (HWCVD10) (Kitakyushu, Japan), September 3–6, 2018

"Annealing behavior of Cat-CVD p-type a-Si for c-Si surface passivation and its superiority over PECVD counterparts"
Huynh Thi Cam Tu, K. Ohdaira, and H. Matsumura
10th International Confenrence on Hot Wire (Cat) and Initiated Chemical Vapor Deposition (HWCVD10) (Kitakyushu, Japan), September 3–6, 2018

"Excellent passivation quality of MPAT crystalline silicon textures for solar cells by using proper chemical cleaning and Cat-CVD SiN_x/a-Si stacked layers"
Cong Thanh Nguyen, K. Ohdaira, and H. Matsumura
10th International Confenrence on Hot Wire (Cat) and Initiated Chemical Vapor Deposition (HWCVD10) (Kitakyushu, Japan), September 3–6, 2018

"Improvement in the passivation quality of Cat-CVD SiN_x films on crystalline Si at room temperature"
J. Miyaura, and K. Ohdaira
10th International Confenrence on Hot Wire (Cat) and Initiated Chemical Vapor Deposition (HWCVD10) (Kitakyushu, Japan), September 3–6, 2018

"Passivation of crystalline silicon surfaces with a few μm-sized pyramids by Cat-CVD silicon nitride films"
J. Liu, Y. Wen, N. Ooyagi, Y. Yamamoto, and K. Ohdaira
10th International Confenrence on Hot Wire (Cat) and Initiated Chemical Vapor Deposition (HWCVD10) (Kitakyushu, Japan), September 3–6, 2018

"Influence of ITO sputtering on the performance of silicon heterojunction solar cells with Cat-CVD amorphous silicon films"
T. Konishi, and K. Ohdaira
10th International Confenrence on Hot Wire (Cat) and Initiated Chemical Vapor Deposition (HWCVD10) (Kitakyushu, Japan), September 3–6, 2018

"Oxygen additive effects on decomposition rate of poly(vinyl phenol)-based polymers using hydrogen radicals produced by a tungsten hot-wire catalyst"
M. Yamamoto, S. Nagaoka, K. Ohdaira, H. Umemoto, H. Horibe
10th International Confenrence on Hot Wire (Cat) and Initiated Chemical Vapor Deposition (HWCVD10) (Kitakyushu, Japan), September 3–6, 2018

"Potential-induced degradation in n-type crystalline silicon photovoltaic cell modules"(invited)
S. Yamaguchi, A. Masuda, and K. Ohdaira
28th Annual NREL Silicon Workshop (Winter Park, Colorado), August 12–15, 2018

"Silicon Heterojunction Solar Cell with a p-type Amorphous Silicon Emitter Formed by Catalytic Impurity Doping"
Katsuya Akiyama and Keisuke Ohdaira　
World Conference on Photovoltaic Energy Conversion (WCPEC-7) (Waikoloa, Hawaii), June 10–15, 2018

"Performance of silicon heterojunction solar cells with various metal-electrodes directly formed on a-Si films without insertion of TCO"
Takeo Konishi, Koichi Koyama, Keisuke Ohdaira, and Hideki Matsumura　
World Conference on Photovoltaic Energy Conversion (WCPEC-7) (Waikoloa, Hawaii), June 10–15, 2018

"An excellent method to control texture size and reflectivity of crystalline silicon solar cells only by mixing glass micro-particles with an alkaline texturing solution"
Cong Thanh Nguyen, Keisuke Ohdaira, and Hideki Matsumura
World Conference on Photovoltaic Energy Conversion (WCPEC-7) (Waikoloa, Hawaii), June 10–15, 2018

"Low Cost Fabrication of Back Contact Crystalline-Silicon Heterojunction Solar Cells with n-a-Si Layers Partially Converted from p-a-Si by Phosphine (PH₃) Plasma Ion-Implantation"
Huynh Thi Cam Tu, Koichi Koyama, Noboru Yamaguchi, Hideo Suzuki, Keisuke Ohdaira, and Hideki Matsumura
World Conference on Photovoltaic Energy Conversion (WCPEC-7) (Waikoloa, Hawaii), June 10–15, 2018

2017

"Application of catalytic chemical vapor deposition to the fabrication process of high-efficiency crystalline silicon solar cells" (invited)
K. Ohdaira, Trinh Cham Thi, S. Tsuzaki, T. Oikawa, J. Seto, K. Koyama, and H. Matsumura
13th China SoG Silicon and PV Power Conference (Wyndham Xuzhou East, China), November 16–18, 2017

"J_sc and V_oc reductions in silicon heterojunction photovoltaic modules by potential-induced degradation tests"
K. Ohdaira, S. Yamaguchi, C. Yamamoto, and A. Masuda
27th International Photovoltaic Science and Engineering Conference (Lake Biwa Otsu Prince Hotel), November 12–17, 2017

"Rapid saturation of potential-induced degradation in n-type c-Si photovoltaic modules"
S. Yamaguchi, K. Nakamura, A. Masuda, and K. Ohdaira
27th International Photovoltaic Science and Engineering Conference (Lake Biwa Otsu Prince Hotel), November 12–17, 2017

"Potential-induced degradation behavior of n-type rear-emitter c-Si photovoltaic modules prestressed in damp-heat tests"
Y. Komatsu, S. Yamaguchi, A. Masuda, and K. Ohdaira
27th International Photovoltaic Science and Engineering Conference (Lake Biwa Otsu Prince Hotel), November 12–17, 2017

"Ignition control of the explosive crystallization of amorphous silicon films by flash lamp annealing"
D. Sato and K. Ohdaira
27th International Photovoltaic Science and Engineering Conference (Lake Biwa Otsu Prince Hotel), November 12–17, 2017

"Passivation effect of ultra-thin SiN_x films formed by Cat-CVD for crystalline silicon surfaces"
H. Song and K. Ohdaira
27th International Photovoltaic Science and Engineering Conference (Lake Biwa Otsu Prince Hotel), November 12–17, 2017

"Passivation of crystalline Si surfaces with small textures by Cat-CVD SiN_x films"
J. Liu, N. Ooyagi, Y. Yamamoto, and K. Ohdaira
27th International Photovoltaic Science and Engineering Conference (Lake Biwa Otsu Prince Hotel), November 12–17, 2017

"Change in the electrical characteristics of a-Si films and a-sS:H/ITO interfaces by boron Cat-doping"
K. Akiyama and K. Ohdaira
27th International Photovoltaic Science and Engineering Conference (Lake Biwa Otsu Prince Hotel), November 12–17, 2017

"Improvement in the minority carrier lifetime of Cat-CVD SiN_x/c-Si structures under room temperature"
J. Miyaura and K. Ohdaira
27th International Photovoltaic Science and Engineering Conference (Lake Biwa Otsu Prince Hotel), November 12–17, 2017

"Chemicaly resistive and high quality trasparent silicon nitride passivation layers for back-contact crystalline silicon solar cells"
H. T. C. Tu, K. Koyama, C. T. Nguyen, S. Terashima, T. Konishi, K. Ohdaira, and H. Matsumura
27th International Photovoltaic Science and Engineering Conference (Lake Biwa Otsu Prince Hotel), November 12–17, 2017

"Long-term degradation of front side copper metallization of silicon solar cells"
W. J. Chen, Y. R. Cheng, K. Ohdaira, K. Higashimine, and X. Zhang
27th International Photovoltaic Science and Engineering Conference (Lake Biwa Otsu Prince Hotel), November 12–17, 2017

"What is the potential-induced degradation? -Systematic study on various kinds of photovoltaic cells-" (invited)
A. Masuda and K. Ohdaira
2nd International Workshop on the Sustainable Actions for "Year by Year Aging" under Reliability Investigations in Photovoltaic Modules (Ryukoku University, Seta Campus), November 11–12, 2017

"ITO sputtering damage to silicon heterojunction solar cells with Cat-CVD a-Si films and its recovery"
T. Konishi and K. Ohdaira
33rd European Photovoltaic Solar Energy Conference and Exhibition (RAI Congress & Exhibition Centre, Amsterdam), September 25–29, 2017

"Low-cost fabrication of patterned electrodes in hetero-junction back-contact silicon solar cells by plasma ion-implantation"
K. Koyama, K. Ohdaira, and H. Matsumura
33rd European Photovoltaic Solar Energy Conference and Exhibition (RAI Congress & Exhibition Centre, Amsterdam), September 25–29, 2017

"Effect of starting point formation on the crystallization of amorphous silicon films by flash lamp annealing"
D. Sato and K. Ohdaira
2017 International Conference on Solid State Devices and Materials (SSDM 2017) (Sendai International Center, Japan), September 19–22, 2017

"Investigation of thermal treatment effects of PbI₂ film yielded two-step type perovskite solar cells"
K. Yamamoto, K. Hamada, M. Shahiduzzaman, K. Yonezawa, M. Karakawa, T. Kuwabara, K. Takahashi, and T. Taima
2017 International Conference on Solid State Devices and Materials (SSDM 2017) (Sendai International Center, Japan), September 19–22, 2017

"Cat-CVD Technology Preparing Excellent Quality Passivation Films for High Efficiency Crystalline Silicon Solar Cells" (invited)
H. Matsumua, K. Koyama, C. T. Nguyen, K. Higashimine, and K. Ohdaira
3rd International Conference on Advanced Energy Material (University of Surrey, Guildford, England), September 11–13, 2017

"Potential-induced degradation of a Si nitride/crystalline Si interface observed through minority carrier lifetime measurement"
N. Nishikawa, S. Yamaguchi, K. Ohdaira
44th IEEE Photovoltaic Specialists Conference (Marriott Wardman Park Hotel, Washington D.C., U.S.), June 25–30, 2017

"Entrance of low cost fabrication of back-contact hetero-junction solar cells by using plasma ion-implantation"
K. Koyama, K. Ohdaira, and H. Matsumura
44th IEEE Photovoltaic Specialists Conference (Marriott Wardman Park Hotel, Washington D.C., U.S.), June 25–30, 2017

"Analysis for leakage currents within unlaminated photovoltaic-module-like layer stacks in a cell-level potential-induced degradation test"
S. Yamaguchi and K. Ohdaira
The 6th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies (EM-NANO 2017) (Aossa, Fukui), June 18–21, 2017

"Long-term potential-induced degradation tests for n-type c-Si-wafer-based photovoltaic cell modules"
Y. Komatsu, S. Yamaguchi, A. Masuda, and K. Ohdaira
The 6th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies (EM-NANO 2017) (Aossa, Fukui), June 18–21, 2017

"Passivation effect of ultra-thin SiN_x films formed by Cat-CVD for crystalline silicon surfaces"
H. Song and K. Ohdaira
The 6th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies (EM-NANO 2017) (Aossa, Fukui), June 18–21, 2017

"Cat-CVD : Damage-Free Thin-Film-Deposition Technique for Fabrication of High Efficiency Solar Cells" (invited)
H. Matsumura, N. C. Thanh, K. Koyama, K. Higashimine, and K. Ohdaira
BIT's 6th Annual World Congress of Advanced Materials-2017 (Xi'an, China), June 14–16, 2017

"Application of Cat-CVD technology to crystalline silicon solar cells" (invited)
K. Ohdaira, Trinh Thi Cham, T. Oikawa, J. Seto, K. Koyama, and H. Matsumura
SCEJ 82nd Annual Meeting (Shibaura Institute of Technology), March 6–8, 2017

"Research on Si photovoltaics in JAIST" (invited)
K. Ohdaira
Japan-Taiwan joint workshop on materials science (JAIST), January 19–20, 2017

2016

"High-quality passivation structures formed by catalytic chemical vapor deposition" (invited)
K. Ohdaira
JSPS Singapore-Japan Joint Workshop in Singapore (Marina Bay Sands, Singapore), October 28, 2016

"Catalytic phosphorus and boron doping to amorphous silicon films"
K. Ohdaira, J. Seto, and H. Matsumura
26th International Photovoltaic Science and Engineering Conference (PVSEC-26) (Marina Bay Sands, Singapore), October 24–28, 2016

"Recovery of ITO sputtering damage for various types of Cat-CVD amorphous silicon passivation films"
T. Konishi and K. Ohdaira
26th International Photovoltaic Science and Engineering Conference (PVSEC-26) (Marina Bay Sands, Singapore), October 24–28, 2016

"Time dependence and saturation behavior of the potential-induced degradation of n-type front-emitter photovoltaic modules"
S. Yamaguchi, K. Hara, A. Masuda, and K. Ohdaira
26th International Photovoltaic Science and Engineering Conference (PVSEC-26) (Marina Bay Sands, Singapore), October 24–28, 2016

"Potential-induced degradation for heterojunction crystalline Si photovoltaic modules"
A. Masuda, C. Yamamoto, S. Yamaguchi, and K. Ohdaira
26th International Photovoltaic Science and Engineering Conference (PVSEC-26) (Marina Bay Sands, Singapore), October 24–28, 2016

"Potential-induced degradation of n-type crystalline silicon photovoltaic modules" (invited)
K. Ohdaira, S. Yamaguchi, C. Yamamoto, K. Hara, and A. Masuda
International Workshop on the Sustainable Actions for "Year by Year Aging" under reliability investigations in photovoltaic modules (SAYURI-PV 2016) (AIST, Tsukuba), October 4–5, 2016

"Progression behavior of the potential-induced degradation of n-type c-Si-wafer-based photovoltaic modules with a front-side p⁺ emitter"
S. Yamaguchi, A. Masuda, K. Ohdaira
International Workshop on the Sustainable Actions for "Year by Year Aging" under reliability investigations in photovoltaic modules (SAYURI-PV 2016) (AIST, Tsukuba), October 4–5, 2016

"Activation of surface recombination at a SiN_x/n-type c-Si interface after potential-induced degradation"
N. Nishikawa, S. Yamaguchi, K. Ohdaira
International Workshop on the Sustainable Actions for "Year by Year Aging" under reliability investigations in photovoltaic modules (SAYURI-PV 2016) (AIST, Tsukuba), October 4–5, 2016

"Potential-induced degradation for silicon heterojunction photovoltaic modules"
C. Yamamoto, S. Yamaguchi, K. Ohdaira, and A. Masuda
International Workshop on the Sustainable Actions for "Year by Year Aging" under reliability investigations in photovoltaic modules (SAYURI-PV 2016) (AIST, Tsukuba), October 4–5, 2016

"Potential-induced degradation of photovoltaic modules with n-type crystalline silicon bifacial cells" (invited)
K. Ohdaira, S. Yamaguchi, K. Hara, and A. Masuda
3rd bifi PV workshop (Seagaia Convention Center, Miyazaki), September 29–30, 2016

"Effect of anti-reflection coating on the crystallization of amorphous silicon films by flash lamp annealing"
Y. Sonoda and K. Ohdaira
2016 International Conference on Solid State Devices and Materials (SSDM2016) (Tsukuba International Congress Center), September 26–29, 2016

"Cat-CVD Silicon Nitride Films and Catalytic Impurity Doping for Application to Silicon-Based Solar Cells" (invited)
Keisuke Ohdaira, Trinh Thi Cham, Koichi Koyama, Junichi Seto, Hideki Matsumura
9th International Confenrence on Hot Wire (Cat) and Initiated Chemical Vapor Deposition (Philadelphia, USA), September 6–9, 2016

"ITO Sputtering Damage to Cat-CVD Amorphous Silicon Passivation Films and Its Recovery"
Takeo Konishi and Keisuke Ohdaira
9th International Confenrence on Hot Wire (Cat) and Initiated Chemical Vapor Deposition (Philadelphia, USA), September 6–9, 2016

"Improved Quality of Flash-Lamp-Crystallized Polycrystalline Silicon Films by Using Low Defect Density Cat-CVD a-Si Films"
Takaki Nozawa and Keisuke Ohdaira
9th International Confenrence on Hot Wire (Cat) and Initiated Chemical Vapor Deposition (Philadelphia, USA), September 6–9, 2016

"Chemical Resistant Silicon Nitride Prepared by Cat-CVD for Solar Cell Application"
Cong Thanh Nguyen, Koichi Koyama, Shigeki Terashima, Huynh Thi Cam Tu, Keisuke Ohdaira, Hideki Matsumura
9th International Confenrence on Hot Wire (Cat) and Initiated Chemical Vapor Deposition (Philadelphia, USA), September 6–9, 2016

"Plasma Ion Implantation to Cat-CVD a-Si Passivation Films"
Koichi Koyama, Noboru Yamaguchi, Miwa Tanaka, Hideo Suzuki, Keisuke Ohdaira, Hideki Matsumura
9th International Confenrence on Hot Wire (Cat) and Initiated Chemical Vapor Deposition (Philadelphia, USA), September 6–9, 2016

"Potential-Induced Degradation Behavior of n-Type Single-Crystalline Silicon Photovoltaic Modules with a Rear-Side Emitter"
Seira Yamaguchi, Atsushi Masuda, Keisuke Ohdaira
43rd IEEE Photovoltaic Specialists Conference (Portland, USA), June 5–10, 2016

"Si heterojunction solar cells with a-Si passivation films formed from liquid Si"
Keisuke Ohdaira, Cheng Guo, Hideyuki Takagishi, Takashi Masuda, Zhongrong Shen, Tatsuya Shimoda
43rd IEEE Photovoltaic Specialists Conference (Portland, USA), June 5–10, 2016

"Cat-CVD passivation realizing extremely low surface recombination velocity < 0.2 cm/s in solar cell structure"
Cong Thanh Nguyen, Koichi Koyama,Shigeki Terashima, Chikao Okamoto, Shuichiro Sugiyama, Keisuke Ohdaira, and Hideki Matsumura
43rd IEEE Photovoltaic Specialists Conference (Portland, USA), June 5–10, 2016

"Effect of Chemical Cleaning before Deposition of Cat-CVD Passivation Films to Realize Extremely Low Surface Recombination Velocity on Textured Structure"
Cong Thanh Nguyen, Koichi Koyama, Shigeki Terashima, Chikao Okamoto, Shuichiro Sugiyama, Keisuke Ohdaira, Hideki Matsumura
2016 MRS Spring Meeting & Exhibit (Phoenix, Arizona, USA), March 28–April 1, 2016

"Application of catalytic chemical vapor deposition (Cat-CVD) to the passivation films of silicon-based solar cells"
K. Ohdaira
The 1st International Symposium of Energy & Environment in JAIST (I SEE JAIST 2016) (JAIST), February 26–29, 2016

2015

"Suppression of the epitaxial growth of Si films in silicon heterojunction solar cells by the formation of ultra-thin oxide layers"
T. Oikawa, K. Ohdaira, K. Higashimine, and H. Matsumura
25th International Photovoltaic Science and Engineering Conference (PVSEC-25) (Busan Exhibition and Convention Center, Korea), November 15–20, 2015

"Potential-induced degradation of photovoltaic modules fabricated using flat mono-crystalline silicon cells with different surface orientations"
S. Yamaguchi and K. Ohdaira
JAIST Symposium on Advanced Science and Technology 2015 (JAIST), November 10–12, 2015

"Formation of thermally stable amorphous silicon passivation films using liquid silicon"
C. Guo and K. Ohdaira
JAIST Symposium on Advanced Science and Technology 2015 (JAIST), November 10–12, 2015

"Formation of thermally stable a-Si passivation films using liquid Si"
C. Guo, K. Ohdaira, H. Takagishi, T. Masuda, Z. Shen, T. Shimoda
2015 International Conference on Solid State Devices and Materials (SSDM 2015) (Sapporo Convention Center), September 27–30, 2015

"Catalytic Doping of Phosphorus and Boron Atoms onto Hydrogenated Amorphous Silicon films"
J. Seto, K. Ohdaira, and H. Matsumura
2015 International Conference on Solid State Devices and Materials (SSDM 2015) (Sapporo Convention Center), September 27–30, 2015

"Behavior of the Potential-Induced Degradation for Photovoltaic Modules Fabricated using Flat Mono-Crystalline Silicon Cells with Different Surface Orientations"
S. Yamaguchi, A. Masuda, and K. Ohdaira
2015 International Conference on Solid State Devices and Materials (SSDM 2015) (Sapporo Convention Center), September 27–30, 2015

"Atomic Scale Study on Interface of Amorphous-Silicon/Crystalline-Silicon"
H. Matsumura, K. Higashimine, K. Koyama, K. Ohdaira, and S. Yokoyama
26th International Conference on Amorphous and Nanocrystalline Semiconductors (ICANS26) (Aachen, Germany), September 13–18, 2015

"Thermal conductivity measurement of liquid-quenched higher manganese silicides"
S. Nishino, M. Miyata, K. Ohdaira, M. Koyano, and T. Takeuchi
34th Annual International Conference on Thermoelectrics (ICT2015) (Dresden), June 28–July 2, 2015

"Defect Termination on c-Si Surfaces by Hydrogen for Improvement in the Passivation Quality of Cat-CVD SiN_x and SiN_x/P Cat-Doped Layers"
Trinh Cham Thi, K. Koyama, K. Ohdaira, and H. Matsumura
5th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies (EM-NANO 2015)(Toki Messe, Niigata), June 16–19, 2015

"Photo-Carrier Generation at a-Si Layer in SiN_x/a-Si Stacked Passivation with Extremely Low Surface Recombination Velocity"
K. Koyama, K. Higashimine, K. Ohdaira, and H. Matsumura
42nd IEEE Photovoltaic Specialists Conference (PVSC-42) (Hyatt Regency, New Orleans), June 14–19, 2015

"Formation of Polycrystalline Silicon Films by Rapid Crystallization for Photovoltaic Application" (invited)
K. Ohdaira
JAIST Japan-India Symposium on Materials Science 2015 (JAIST), March 2–3, 2015

"Development of High-Quality Cat-CVD SiN_x Passivation Layer for Crystalline Si Solar Cells"
Trinh Cham Thi, K. Koyama, K. Ohdaira, and H. Matsumura
JAIST Japan-India Symposium on Materials Science 2015 (JAIST), March 2–3, 2015

"Improvement in the Interface Quality of Cat-CVD a-Si/c-Si Heterojunction Solar Cells by the Formation of Ultra-Thin Oxide Layers"
T. Oikawa, K. Ohdaira, K. Higashimine, and H. Matsumura
JAIST Japan-India Symposium on Materials Science 2015 (JAIST), March 2–3, 2015

2014

"Application of c-Si surface oxidation to a-Si/c-Si heterojunction solar cells"
T. Oikawa, K. Ohdaira, and H. Matsumura
The 6th World Conferenceon Photovoltaic Energy Conversion (WCPEC-6) (Kyoto International Conference Center), November 23–27, 2014

"The formation of thin poly-Si films on textured TCO by flash lamp annealing"
T. Watanabe and K. Ohdaira
The 6th World Conferenceon Photovoltaic Energy Conversion (WCPEC-6) (Kyoto International Conference Center), November 23–27, 2014

"Passivation quality of Cat-CVD SiN_x and SiN_x/P Cat-doped layers on textured c-Si wafers"
Trinh Cham Thi, K. Koyama, K. Ohdaira, and H. Matsumura
The 6th World Conferenceon Photovoltaic Energy Conversion (WCPEC-6) (Kyoto International Conference Center), November 23–27, 2014

"Activation of Cat-Doped Phosphorus Atoms by Flash Lamp Annealing"
K. Ohdaira, Trinh Cham Thi, S. Tsuzaki, and H. Matsumura
The 6th World Conferenceon Photovoltaic Energy Conversion (WCPEC-6) (Kyoto International Conference Center), November 23–27, 2014

"A Novel Low Temperature Doping Technology, Cat-Doping, and Its Application to Solar Cells"
H. Matsumura, S. Tsuzaki, Trinh Thi Cham, K. Koyama, and K. Ohdaira
The 6th World Conferenceon Photovoltaic Energy Conversion (WCPEC-6) (Kyoto International Conference Center), November 23–27, 2014

"Application of Heterojunction to Si-based Solar Cells Using Photonic Nanostructures Coupled with Vertically Aligned Ge Quantum Dots"
I. Takahashi, Y. Hoshi, T. Tayagaki, T. Oikawa, K.Ohdaira, and N. Usami
The 6th World Conferenceon Photovoltaic Energy Conversion (WCPEC-6) (Kyoto International Conference Center), November 23–27, 2014

"Potential-Induced Degradation of Cu(In,Ga)Se₂ Photovoltaic Modules"
S. Yamaguchi, K. Hara, H. Komaki, Y. Shimizu-Kamikawa, H. Shibata, S. Niki, Y. Kawakami, and A. Masuda
The 6th World Conferenceon Photovoltaic Energy Conversion (WCPEC-6) (Kyoto International Conference Center), November 23–27, 2014

"Significant improvement in the passivation property of Cat-CVD SiN_x/c-Si structure by applying P Cat-doping"
Trinh Cham Thi, K. Koyama, K. Ohdaira, and H. Matsumura
The 8th Hot-Wire (Cat) Chemical Vapor Deposition (HWCVD-8) (Braunschweig, Germany), October 13–16, 2014

"The formation of poly-Si films on flat glass substrates by the flash lamp annealing of Cat-CVD a-Si films"
T. Watanabe and K. Ohdaira
The 8th Hot-Wire (Cat) Chemical Vapor Deposition (HWCVD-8) (Braunschweig, Germany), October 13–16, 2014

"Improvement in Cat-CVD a-Si/c-Si heterojunction interface by the formation of an ultra-thin oxide layer on c-Si"
T. Oikawa, K. Ohdaira, K. Higashimine, and H. Matsumura
The 8th Hot-Wire (Cat) Chemical Vapor Deposition (HWCVD-8) (Braunschweig, Germany), October 13–16, 2014

"Conductivity modulation in amorphous silicon films by catalytic doping"
K. Ohdaira, S. Tsuzaki, Y. Sakuma, T. Oikawa, J. Seto, and H. Matsumura
The 8th Hot-Wire (Cat) Chemical Vapor Deposition (HWCVD-8) (Braunschweig, Germany), October 13–16, 2014

"Cat-doping: a novel low temperature impurity doping technology using hot catalyzing wires"(invited)
H. Matsumura, D. H. Chi, Trinh Cham Thi, S. Tsuzaki, K. Koyama, and K. Ohdaira
The 8th Hot-Wire (Cat) Chemical Vapor Deposition (HWCVD-8) (Braunschweig, Germany), October 13–16, 2014

"Optical loss in Cat-CVD SiN_x/a-Si passivation with low surface recombination velocity"
K. Koyama, Trinh Cham Thi, K. Higashimine, K. Ohdaira, and H. Matsumura
The 8th Hot-Wire (Cat) Chemical Vapor Deposition (HWCVD-8) (Braunschweig, Germany), October 13–16, 2014

"Application of Catalytic Phosphorus Doping to a-Si/c-Si Heterojunction Solar Cells"
S. Tsuzaki, K. Ohdaira, T. Oikawa, K. Koyama, and H. Matsumura
The 29th European Photovoltaic Solar Energy Conference and Exhibition (RAI Congress & Exhibition Centre, Amsterdam), September 22–26, 2014

"Requirements for Achieving Extremely Low Surface Recombination Velocity and Negligible Optical Loss in Cat-CVD SiN_x/a-Si Stacked Passivation"
K. Koyama, Trinh Cham Thi, K. Higashimine, K. Ohdaira, and H. Matsumura
The 40th IEEE Photovoltaic Specialists Conference (Colorado Convention Center), June 8–13, 2014

"Thermal conductivity measurement of aggregated (Bi_1-xSb_x)Te nanoparticles using 3ω method"
S. Nishino, K. Suekuni, K. Ohdaira, and M. Koyano
The 33rd International Conference on Thermoelectrics (ICT2014) (Nashville, Tennessee, USA), June 6–10, 2014

"CMOS ISFET Sensor Array with Catalytic Chemical Vapor Deposited Silicon Nitride Layer and Its Medical Application"
S. Sando, S. Uno, K. Nakazato, K. Ohdaira, and H. Matsumura
Design of Medical Devices Conference (University of Minnesota twin city), April 7–10, 2014

2013

"Extremely Low Surface Recombination Velocity of Crystalline Silicon Realized by Low Temperature Phosphorus Cat-Doping and Successive Deposition of Cat-CVD Silicon-Nitride Films"
Trinh Cham Thi, K. Koyama, K. Ohdaira, and H. Matsumura
23rd International Photovoltaic Science and Engineering Conference (PVSEC-23) (Taipei, Taiwan), October 28–November 1, 2013

"Application of Cat-CVD SiN_x/a-Si Stacked Passivation Films to Crystalline Si Solar Cells"
S. Tsuzaki, K. Koyama, K. Ohdaira, and H. Matsumura
23rd International Photovoltaic Science and Engineering Conference (PVSEC-23) (Taipei, Taiwan), October 28–November 1, 2013

"The use of toughened glass substrates for the formation of polycrystalline silicon films by flash lamp annealing"
K. Ohdaira
23rd International Photovoltaic Science and Engineering Conference (PVSEC-23) (Taipei, Taiwan), October 28–November 1, 2013

"Stability of Cat-CVD Silicon-Nitride/Amorphous-Silicon Stacked Passivation System Realizing Extremely Low Surface Recombination Velocity"
K. Koyama, K. Ohdaira, and H. Matsumura
23rd International Photovoltaic Science and Engineering Conference (PVSEC-23) (Taipei, Taiwan), October 28–November 1, 2013

"10-µmm-Thick Polycrystalline Silicon Films Formed by Flash Lamp Annealing"
K. Ohdaira
28th European Photovoltaic Energy conference and Exhibition (Paris, France), September 30–October 4, 2013

"Polycrystalline Silicon Films with Spontaneously-formed Nanostructures Formed by Flash Lamp Annealing" (invited)
K. Ohdaira
BIT's 3rd Annual World Congress of Nano Science & Technology (Xi'an, China), September 26–28, 2013

"Effect of Annealing on the Vertical Structural Distribution of Solution-Processed a-Si:H Films"
Y. Sakuma, K. Ohdaira, T. Masuda, H. Takagishi, Z. Shen, and T. Shimoda
2013 International Conference on Solid State Devices and Materials (SSDM2013) (Hilton Fukuoka Sea Hawk), September 24–27, 2013

"Deposition of moisture barrier films by Cat-CVD using hexamethyldisilazane (HMDS)"
K. Ohdaira and H. Matsumura
2013 JSAP-MRS Joint Symposia (Doshisha University, Kyoto), September 16–20, 2013

"High Passivation Quality on c-Si Surface Realized by a Stoichiometric SiN_x Single Layer Prepared by Cat-CVD and Successive Annealing"
Trinh Cham Thi, K. Koyama, K. Ohdaira, and H. Matsumura
2013 JSAP-MRS Joint Symposia (Doshisha University, Kyoto), September 16–20, 2013

"Low Temperature Phosphorus or Boron Doping into Crystalline Silicon by Catalytically Generated Species in Cat-CVD Systems"
H. Matsumura, T. Hayakawa, T. Ohta, K. Koyama, and K. Ohdaira
2013 JSAP-MRS Joint Symposia (Doshisha University, Kyoto), September 16–20, 2013

"Study on Light-Soaking Degradation for High Quality Cat-CVD SiNx/a-Si Stacked Layers Passivation"
K. Koyama, K. Ohdaira, and H. Matsumura
2013 JSAP-MRS Joint Symposia (Doshisha University, Kyoto), September 16–20, 2013

"The effects of catalytic-generated atomic H treatment on a-Si:H using "Liquid-Si Printing""
H. Murayama, T. Ohyama, A. Terakawa, H. Takagishi, T. Masuda, K. Ohdaira, and T. Shimoda
2013 JSAP-MRS Joint Symposia (Doshisha University, Kyoto), September 16–20, 2013

"Degradation of a-SiON barrier films formed by Cat-CVD in the PCT environment"
M. Asano, S. Koyama, K. Ohdaira, S. Nagata, and H. Matsumura
2013 JSAP-MRS Joint Symposia (Doshisha University, Kyoto), September 16–20, 2013

"A Method to Evaluate Explosive Crystallization Velocity of Amorphous Silicon Films during Flash Lamp Annealing"
K. Ohdaira
The 25th International Conference on Amorphous and Nano-Crystalline Semiconductors (ICANS-25) (Toronto, Canada), August 18–23, 2013

"Development of a-Si Solar Cells using "Liquid Silicon Printing""
H. Murayama, T. Ohyama, A. Terakawa, H. Takagishi, T. Masuda, K. Ohdaira, and T. Shimoda
The 25th International Conference on Amorphous and Nano-Crystalline Semiconductors (ICANS-25) (Toronto, Canada), August 18–23, 2013

"Development of thermal conductivity measurement system by the 3ω method and application to thermoelectric particles"
S. Nishino, K. Suekuni, K. Ohdaira, and M. Koyano
The 32nd International Conference on Thermoelectrics (ICT2013) (Kobe, Japan), June 30–July 4 (2013)

"Formation of polycrystalline silicon films by flash lamp annealing" (invited)
K. Ohdaira
Collaborative Conference on Materials Research (CCMR) 2013 (Jeju island, South Korea), June 24–28, 2013

"Formation of Polycrystalline Silicon Films with Various Microstructures by Flash Lamp Annealing of Micrometer-Order-Thick Amorphous Silicon Films" (invited)
K. Ohdaira
The Collaborative Conference on Crystal Growth (3CG) 2013 (Cancun, Mexico), June 10–13, 2013

"Flash Lamp Annealing as a Method of Crystallizing Amorphous Silicon Films to form Thick Polycrystalline Silicon Films" (invited)
K. Ohdaira
BIT's 2nd Annual World Congress of Advanced Materials 2013 (Suzhou, China), June 5–7, 2013

2012

"Polycrystalline Silicon Films Formed by Flash Lamp Annealing for Solar Cell Application" (invited)
K. Ohdaira
The Collaborative Conference on Crystal Growth (3CG) 2012 (Orlando Florida, USA), December 11–14, 2012

"Photovoltaic effect of large-grain polycrystalline silicon films formed by flash lamp annealing"
K. Ohdaira and S. Varlamov
22nd international Photovoltaic Science and Engineering Conference (Hangzhou, China), November 5–9, 2012

"Surface Passivation on Crystalline Silicon with Low Optical Reflectivity and Low Surface Recombination Velocity"
H. Matsumura, K. Katoh, K. Koyama, K. Ohdaira
22nd international Photovoltaic Science and Engineering Conference (Hangzhou, China), November 5–9, 2012

"Study on Stability of SiN_x/a-Si Stacked Passivation Layer Realizing Extremely Low Surface Recombination Velocity"
T. Goto, K. Koyama, K. Ohdaira, and H. Matsumura
22nd international Photovoltaic Science and Engineering Conference (Hangzhou, China), November 5–9, 2012

"Low Temperature Doping of P and B atoms into Crystalline Si by Catalytically Generated Species from PH₃ and B₂H₆"
T. Ohta, K. Koyama, K. Ohdaira, and H. Matsumura
22nd international Photovoltaic Science and Engineering Conference (Hangzhou, China), November 5–9, 2012

"The control of the film stress of Cat-CVD a-Si films and its impact on explosive crystallization induced by flash lamp annealing" (invited)
K. Ohdaira
7th International Conference on Hot-Wire Chemical Vapor Deposition (Osaka), October 8–12, 2012

"Surface passivation of c-Si wafers using Cat-CVD SiNx/Si-rich SiNx stacked films"
Trinh Cham Thi, K. Koyama, K. Ohdaira, and H. Matsumura
7th International Conference on Hot-Wire Chemical Vapor Deposition (Osaka), October 8–12, 2012

"Photo-stability of a-Si solar cells fabricated by “Liquid-Si printing method” and treated with catalytic generated atomic hydrogen"
H. Murayama, T. Ohyama, I. Yoshida, A. Terakawa, T. Masuda, K. Ohdaira, and T. Shimoda
7th International Conference on Hot-Wire Chemical Vapor Deposition (Osaka), October 8–12, 2012

"Low Temperature Boron Doping into Crystalline Silicon by Boron-Containing Species Generated in Cat-CVD Apparatus"
T. Ota, K. Koyama, K. Ohdaira, and H. Matsumura
7th International Conference on Hot-Wire Chemical Vapor Deposition (Osaka), October 8–12, 2012

"Study on Light-Soaking Degradation and Damp Heat Tests for Cat-CVD SiN_x/a-Si Stacked Passivation Films Realizing Extremely Low Surface Recombination Velocity"
K. Koyama, T. Goto, K. Ohdaira, and H. Matsumura
27th European Photovoltaic Solar Energy Conference and Exhibition (Frankfurt), September 24–28, 2012

"Defect Termination of Flash-Lamp-Crystallized Large-Grain Polycrystalline Silicon Films by High-Pressure Water Vapor Annealing"
Keisuke Ohdaira
2012 International Conference on Solid State Devices and Materials (Kyoto), September 25–27, 2012

"Pixel Controlling Substrate Fabricated by Embedding Millions of Silicon IC Chips on Plastic Substrate and Self-Aligned Metal Interconnection Among Such IC Chips"
N. T. T. Kieu, T. Yagi, K. Ohdaira, and H. Matsumura
SID International Symposium, Seminar, and Exhibition, Boston, USA, June 3–8, 2012

"Formation of polycrystalline silicon films with μm-order-long grains through liquid-phase explosive crystallization by flash lamp annealing"
K. Ohdaira, S. Varlamov, N. Usami, and H. Matsumura
38th IEEE Photovoltaic Specialists Conference, Austin, USA, June 3–8, 2012

"Study of the Relationship Between a Gas-Barrier Property and the Membrane Stress of Films Made by a Cat-CVD Method"
T. Tsutsumi, H. Yanagihara, H. Amanai, S.Yoshida, Y. Watanabe, K. Ohdaira, and H. Matsumura
55th 2012 SVC Annual Technical Conference, Santa Clara, USA, April 28–May 3, 2012

"Photovoltaic Technology in JAIST, Japan, and East Asia"
K. Ohdaira
The 2nd China-Japan-Korea Young Researchers Workshop, Shanghai, China, April 28, 2012

"Observation of Different Explosive Crystallization Modes in Sputtered, Evaporated, and Their Stacked a-Si Films"
K. Ohdaira and H. Matsumura
2012 MRS Spring Meeting, San Francisco, USA, April 9–13, 2012

2023

"Application of Si-related Ultrathin (∼1 nm) Films to Crystalline Silicon Solar Cells"
Keisuke Ohdaira, Hiroki Nakajima, Yuli Wen, and Huynh Thi Cam Tu
Vac. Surf. Sci. 66, 91-96 (2023).
Journal Page

2022

"The Work Behind the Scenes for the First Ever Online Event of SSDM2020"
K. Ohdaira
AAPPS Bulletin 32, 4-6-11 (2022).
Journal Page

2015

"Chemical Science of π-Electron Systems", Chapter 34
Efficient Organic Devices Based on π-Electron Systems: Comparative Study of Fullerene Derivatives Blended with a High Efficiency Naphthobisthiadiazole-Based Polymer for Organic Photovoltaic Applications
Varun Vohra, Koichi Higashimine, Keisuke Ohdaira, Shogo Tsuzaki, Hideyuki Murata
Springer, pp. 575-588, 2015
Book Page

2014

"Subsecond Annealing of Advanced Materials", Chapter 10
Formation of High-Quality µm-Order-Thick Poly-Si Films on Glass-Substrates by Flash Lamp Annealing
Keisuke Ohdaira
Springer, pp. 173-188, 2014
Book Page

2011以前

2009

"Crystal Growth of Si for Solar Cells", Chapter 11
Thin Film Poly-Si Formed by Flash Lamp Annealing
Keisuke Ohdaira
Springer, pp. 177-191, 2009
Book Page