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25 June 2014 Fundamentals and recent results of super high-efficiency solar cells
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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.
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Masafumi Yamaguchi, Kazuma Ikeda, Tatsuya Takamoto, Nobuaki Kojima, and Yoshio Ohshita "Fundamentals and recent results of super high-efficiency solar cells", Proc. SPIE 9083, Micro- and Nanotechnology Sensors, Systems, and Applications VI, 908312 (25 June 2014);

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