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Proceedings Paper

Novel materials for high-efficiency solar cells
Author(s): Nobuaki Kojima; Masato Natori; Hidetoshi Suzuki; Makoto Inagaki; Yoshio Ohshita; Masafumi Yamaguchi
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Paper Abstract

Our Toyota Technological Institute group has investigated various novel materials for solar cells from organic to III-V compound materials. In this paper, we report our recent results in conductivity control of C60 thin films by metal-doping for organic solar cells, and mobility improvement of (In)GaAsN compounds for III-V tandem solar cells. The epitaxial growth of Mg-doped C60 films was attempted. It was found that the epitaxial growth of Mg-doped C60 film was enabled by using mica (001) substrate in the low Mg concentration region (Mg/C60 molar ratio < 1). The crystal quality of the epitaxial Mg-doped C60 film was improved drastically in compared with micro-crystalline film on glass substrate. Such drastic improvement of crystal quality in the epitaxial films resulted significant increase in conductivity. This result may indicate the significant increase of carrier mobility. Crystal quality improvement of CBE-grown GaAsN materials was investigated. We achieved the reduction of residual impurity concentration by chemical reaction control on the growing surface by modifying flow sequence of precursors and by increasing step density on the surface by using a vicinal GaAs substrate. Furthermore, the improvement in carrier mobility was observed, and it was suggested that the reduction of both residual impurities and N-related defects leads this improvement.

Paper Details

Date Published: 12 October 2009
PDF: 8 pages
Proc. SPIE 7518, Photonics and Optoelectronics Meetings (POEM) 2009: Solar Cells, Solid State Lighting, and Information Display Technologies, 75180P (12 October 2009); doi: 10.1117/12.845456
Show Author Affiliations
Nobuaki Kojima, Toyota Technological Institute (Japan)
Masato Natori, Toyota Technological Institute (Japan)
Hidetoshi Suzuki, Toyota Technological Institute (Japan)
Makoto Inagaki, Toyota Technological Institute (Japan)
Yoshio Ohshita, Toyota Technological Institute (Japan)
Masafumi Yamaguchi, Toyota Technological Institute (Japan)

Published in SPIE Proceedings Vol. 7518:
Photonics and Optoelectronics Meetings (POEM) 2009: Solar Cells, Solid State Lighting, and Information Display Technologies
Michael Grätzel; Hiroshi Amano; Chin Hsin Chen; Changqing Chen; Peng Wang, Editor(s)

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