The III‐V compound multi‐junction solar cells have high efficiency potential of more than 50% due to wide photo response, while limiting efficiencies of single‐junction solar cells are 31‐32%. In order to realize high efficiency III‐V compound multi‐junction (MJ) solar cells, understanding and controlling imperfections (defects) are very important. This paper reviews fundamentals for major losses of III‐V compound materials and solar cells, key issues for super high‐efficiency MJ solar cells and recent R&D status of III‐V compound MJ solar cells. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Masafumi Yamaguchi (2015) studied this question.