Sulfurization of Copper Indium Diselenide Synthetized by Sol-Gel Spin-Coating Method

A non-vacuum process for fabrication of polycrystalline CuIn(Se,S)2 (CISS) thin films with chalcopyrite structure were synthesized by sol-gel spin-coating method using nitrates as precursor for low-cost photovoltaic applications. Sequential reduction, selenization and sulfurization treatments were performed with hydrogen, Se and H2S vapor, respectively. X-ray diffraction (XRD), SEM and EDS analysis have been employed to examine the structural properties, surface morphology and atomic concentrations of polycrystalline CISS thin films. The experimental results demonstrated that the obtained CISS had good crystallinity, uniformity and near stoichiometric composition.