Properties of CuIn(SxSe1−x)2 polycrystalline thin films prepared by chemical spray pyrolysis Original Research Article

CuIn(SxSe1−x)2 thin polycrystalline films were grown by the chemical spray pyrolysis method on the glass substrate at 280–400°C. The alloy composition in the film was studied with relation to that in the splay solution. Films were characterized by X-ray diffraction, optical absorption, Raman spectroscopy, resistivity and surface morphology. The CuInSe2-rich alloy films grown at high substrate temperature had chalcopyrite structure, while, the CuInS2-rich films grown at low substrate temperature exhibited sphalerite structure. Optical-gap energies were smaller than that of the bulk crystal by 0.1–0.2 eV for CuInS2-rich films. Raman spectra exhibited both CuInSe2-like and CuInS2-like A1 modes, and their relative changed systematically with alloy composition.