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CuS thin films with hexagonal have been successfully deposited on glass substrate by thermal coevaporation of copper and sulphur. The effect of CuS film thickness on the structural and optical properties have investigated and discussed. Structural and optical investigations of the films were carried out by X-ray diffraction, atomic force microscopy, high-resolution transmission electron microscopy and UV spectroscopy. XRD and TEM results confirm that deposited films are hexagonal covellite CuS films. The increased in crystallite size are absorbed as film thickness increases from 100 nm to 200...