Preparation of Cu(In1-xAlx)Se2 thin films by sol-gel method

摘要

Polycrystalline Cu(In1-xAlx)Se2 (CIAS) thin films with chalcopyrite structure were synthesized by sol-gel spincoating method using nitrates as precursor for low-cost photovoltaic applications.Sequential reduction and selenization treatments were performed with hydrogen and Se vapor,respectively.X-ray diffraction (XRD),SEM,EDS and UV-visible spectrophotometer analysis have been employed to examine the structural properties,surface morphology,atomic concentrations and band gaps of polycrystalline CIAS thin films.The experimental results demonstrated that the Cu(In1-xAlx)Se2 had good crystallinity,uniformity and stoichiometric composition.Simultaneously,we discussed the phenomenon and mechanism of the twolayered structure formation of the synthesized Cu(In1- xAlx)Se2 thin film.