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Proceedings Paper

Fundamentals and recent results of super high-efficiency solar cells
Author(s): Masafumi Yamaguchi; Kazuma Ikeda; Tatsuya Takamoto; Nobuaki Kojima; Yoshio Ohshita
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Paper Abstract

III-V compound multi-junction (MJ) solar cells have great potential for space and terrestrial applications because they have high efficiency potential of more than 50% and superior radiation-resistance. Recently, more than 40% efficiency cells were reported by Fraunhofer ISE, Spectrolab, Sharp and others. Concentrator 4-junction or 5-junction solar cells have great potential for realizing super high-efficiency of over 50%. In order to realize super high-efficiency of more than 50%, it is substantially important to understand and reduce several losses of solar cells. This paper reviews loss mechanism for III-V compound solar cells and MJ solar cells. In addition, recent results under the EU-Japan Collaborative Research on Concentrator Photovoltaics are also presented. The conversion efficiency of inverted epitaxially grown InGaP/GaAs/InGaAs triple-junction solar cells has been improved to 37.9% (1-sun, AM1.5G) and 44.4% (250- 300 suns) as a result of proposing double-hetero structure wide-band-gap tunnel junctions, and inverted epitaxial growth.

Paper Details

Date Published: 25 June 2014
PDF: 12 pages
Proc. SPIE 9083, Micro- and Nanotechnology Sensors, Systems, and Applications VI, 908312 (25 June 2014); doi: 10.1117/12.2051733
Show Author Affiliations
Masafumi Yamaguchi, Toyota Technological Institute (Japan)
Kazuma Ikeda, Toyota Technological Institute (Japan)
Tatsuya Takamoto, Sharp Corp. (Japan)
Nobuaki Kojima, Toyota Technological Institute (Japan)
Yoshio Ohshita, Toyota Technological Institute (Japan)

Published in SPIE Proceedings Vol. 9083:
Micro- and Nanotechnology Sensors, Systems, and Applications VI
Thomas George; M. Saif Islam; Achyut K. Dutta, Editor(s)

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