Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Copper indium gallium (di)selenide (CIGS), (CAS NO. 12018-95-0), is a I-III-VI2 compound semiconductor material composed of copper, indium, gallium, and selenium. The material is a solid solution of copper indium selenide (often abbreviated "CIS") and copper gallium selenide, with a chemical formula of CuInxGa(1-x)Se2, where the value of x can vary from 1 (pure copper indium selenide) to 0 (pure copper gallium selenide).

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