Cu0.95In1.05Se2.05

Cu0.95In1.05Se2.05 is a narrow-bandgap semiconductor compound based on the copper indium selenide (CIS) family, with composition near the stoichiometric CuInSe2 but slightly indium-rich and selenium-rich. This material is primarily investigated for photovoltaic applications, particularly as an absorber layer in thin-film solar cells, where its tunable bandgap and strong light absorption make it an attractive alternative to cadmium telluride and silicon-based cells. The slight deviation from ideal stoichiometry is deliberately engineered to optimize defect states and carrier transport, making it particularly relevant for research into high-efficiency polycrystalline solar absorbers and tandem photovoltaic devices.