Effects of sulfur source concentration and deposition time on structure, morphology and optical properties of ZnS nanocrystalline thin films

In this research, ZnS nanostructure thin films with thicknesses of 130-210 nm were prepared on glass substrates at 70 C by chemical bath deposition method. In this method, thioacetamide and triethylamine were used as a S-2 source and a completing agent instead of ammonia, respectively. The effect of changes in concentration ratio of thioacetamide to zinc as well as deposition time on structure, surface morphology, particle size, thickness and optical properties of the layers were examined by X-ray diffraction XRD, field emission scanning electron microscopy FE-SEM, atomic force microscopy AFM and ultraviolet-visible UV-vis. spectroscopy. UV-vis. spectroscopy data showed the prepared ZnS films to have more than 70 transmission in the visible region and an optical band gap ranging from 3.75 to 4.1 eV. XRD results revealed that the obtained films were highly crystalline with a cubic structure. FE-SEM images showed that the surface of the films was covered with homogenous, dense and fine spherical nanoparticles.