Abstract

CuInSe2 (CIS) is one of the I–III–VI2 compound semiconductors with a chalcopyrite-type crystal structure. The characteristics of chemical bonds in CIS differ from those of conventional III–V and II–VI compound semiconductors. The characteristics of chemical bonds in CIS are advantageous for the fabrication of high-quality CIS thin films used in solar cells. The reasons why the “three-stage process” and “selenization process” are used for the fabrication of high-efficiency solar cells are discussed on the basis of recent studies of chemical bonds in CIS.

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