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Keisuke Ohdaira Associate 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

  • High-quality surface passivation of c-Si with chemical resistance and optical transparency by using Cat-CVD SiNx double layers and an ultra-thin SiOx film,Huynh Thi Cam Tu, K. Koyama, Cong Thanh Nguyen, K. Ohdaira, and H. Matsumura,Jpn. J. Appl. Phys. (in press)
  • Photoresist removal using H radicals generated by iridium hot wire catalyst,M. Yamamoto, S. Nagaoka, H. Umemoto, K. Ohdaira, T. Nishiyama, and H. Horibe,Int. J. Polym. Sci.,2017,2983042-1-5,2017
  • Suppression of the epitaxial growth of Si films in Si heterojunction solar cells by the formation of ultra-thin oxide layers,K. Ohdaira, T. Oikawa, K. Higashimine, and H. Matsumura,Current Appl. Phys.,16,1026-1029,2016

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◇Lectures and Presentations

  • 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,Waikoloa, Hawaii,2018年6月10-15日
  • 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,Waikoloa, Hawaii,2018年6月10-15日
  • 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,Waikoloa, Hawaii,2018年6月10-15日

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■Extramural Activities

◇Academic Society Affiliations

  • Active-Matrix Flatpanel Displays and Devices (AM-FPD),Session leader,2016-
  • 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-
  • 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