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Copper indium gallium -LRB- di -RRB- selenide -LRB- CIGS -RRB- is a I-III-VI2 semiconductor material composed of copper , indium , gallium , and selenium .. Alkali metal. III. Group 3 element. semiconductor material. semiconductor material. copper. copper. indium. indium. gallium. gallium. selenium. selenium. The material is a solid solution of copper indium selenide -LRB- often abbreviated `` CIS '' -RRB- and copper gallium selenide .. copper. copper. indium. indium. gallium. gallium. solid solution. solid solution. It has a chemical formula of CuInxGa -LRB- 1-x -RRB- Se2 where the value of x can vary from 1 -LRB- pure copper indium selenide -RRB- to 0 -LRB- pure copper gallium selenide -RRB- .. copper. copper. indium. indium. gallium. gallium. CIGS is a tetrahedrally bonded semiconductor , with the chalcopyrite crystal structure , and a bandgap varying continuously with x from about 1.0 eV -LRB- for copper indium selenide -RRB- to about 1.7 eV -LRB- for copper gallium selenide -RRB- .. copper. copper. indium. indium. gallium. gallium. chalcopyrite. chalcopyrite. bandgap. bandgap