Properties of CuIn(SxSe1-x)2 polycrystalline thin films prepared by chemical spray pyrolysis

CuIn(SxSe1-x)(2) thin polycrystalline films were grown by the chemical spray pyrolysis method on the glass substrate at 280-400 degrees 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 CutnS(2)-like A(1) modes, and their relative changed systematically with alloy composition. (c) 2005 Elsevier Ltd. All rights reserved.