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Keisuke Ohdaira Professor
School of Materials Science、Energy and Environment Area

■Degrees

B.S., M.S. and Ph.D. from The University of Tokyo.(1998, 2000, 2004)

■Specialties

Solar cell, Semiconductor

■Research Keywords

Solar cells, Poly-Si, Catalytic chemical vapor deposition

■Research Interests

Formation of high-quality poly-Si films by flash lamp annealing and their application to high-efficiency solar cells
We investigate on formation of high-quality poly-Si on glass substrates by flash lamp annealing, with millisecond duration, of Cat-CVD a-Si films and fabrication of solar cells using the poly-Si films.

Application of Cat-CVD to the fabrication process of c-Si solar cells
Cat-CVD (catalytic chemical vapor deposition), in which gas molecules are decomposed on heated catalyzing wire by catarytic reaction, can deposit high-quality passivation films to reduce the recombination of photo-generated carriers on crystalline Si surface. We develop high-quality Cat-CVD passivation films for crystalline Si solar cells. We also investigate a novel doping method using a Cat-CVD system.
Potential-induced degradation for n-type crystalline silicon photovoltaic modules
The performance degradation of photovoltaic modules originating from a large voltage between an Al frame and cells (potential-induced degradation: PID) has been a significant problem in large-scale PV power plants. We investigate the mechanism of PID and its suppression particularly for n-type c-Si PV modules, which have higher performances than p-type ones and are thus expected to be widely utilized in the future.

■Publications

◇Books

  • Subsecond Annealing of Advanced Materials, Chapter 10, Formation of High-Quality オm-Order-Thick Poly-Si Films on Glass-Substrates by Flash Lamp Annealing,Keisuke Ohdaira,Springer,2014,pp. 173-188
  • Crystal Growth of Si for Solar Cells, Chapter 11, "Thin Film Poly-Si Formed by Flash Lamp Annealing",Keisuke Ohdaira,Springer,2009,pp. 177-191
  • 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,2015,pp.575-588

◇Published Papers

  • Improvement in the passivation quality of catalytic-chemical-vapor-deposited silicon nitride films on crystalline Si at room temperature,J. Miyaura and K. Ohdaira,Thin Solid Films,674,103-106,2019
  • 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,Jpn. J. Appl. Phys.,58,SBBF06-1-5,2019
  • Crystallization of electron-beam evaporated a-Si films on textured glass substrates by flash lamp annealing,K. Kurata and K. Ohdaira,Jpn. J. Appl. Phys.,58,SBBF06-1?5,2019

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◇Lectures and Presentations

  • 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,Brussels, Belgium,2018年9月24-28日
  • ITO sputtering damage to silicon heterojunction solar cells with Cat-CVD a-Si films and its recovery,K. Konishi and K. Ohdaira,33rd European Photovoltaic Solar Energy Conference and Exhibition,RAI Congress & Exhibition Centre, Amsterdam,2017年9月25-29日
  • 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,2017年9月25-29日

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■Extramural Activities

◇Academic Society Affiliations

  • 9th International Conference on Hot Wire (Cat) and Initiated Chemical Vapor Deposition,International Advisory Committee member and guest editor for the special issue of Thin Solid Fiilms,2016-
  • Active-Matrix Flatpanel Displays and Devices (AM-FPD),Session leader,2016-
  • EM-NANO 2017,Organizing Committee,2016-

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◇Other Activities

  • The 2nd China-Japan-Korea Young Researchers Workshop,Japanese delegate, presentation entitled "Photovoltaic Technology in JAIST, Japan, and East Asia" in the "Prospects for the development of new energy" section.,2012/04/28 -

■Academic Awards Received

  • PVSEC-27 Best Paper Award,PVSEC-27 Technical Program Committee,2017