Structural and optical properties of CuInTe 2 films prepared by thermal vacuum evaporation from a single source

Abstract

The CuInTe 2 thin films were prepared by thermal vacuum evaporation from a single source. The effects of heat treatment on both structural an optical properties of CuInTe 2 films were studied. X-ray diffraction studies reveal that the films prepared by the present method showed formation of single phase CuInTe 2 at heating treatment temperature higher than 300°C. The calculated lattice constants for CuInTe 2 films annealed at 300°C were found to be a = 6.21 A ̊ and c = 12.35 A ̊ . The value of the grain size obtained in these films was of the order of 50 nm. The value of optical energy gap (0.97 eV) and the dispersive refractive index n(λ) for CuInTe 2 film annealed at 300°C were evaluated by optical absorption measurement.