Sb 2 S 3 thin films were obtained by evaporating the powder of Sb 2 S 3 compound onto glass substrates maintained at room temperature and at substrate temperature 423 K under vacuum pressure of (2 10 -5 ) torr. The composition of Sb 2 S 3 powder was determined by atomic absorption spectroscopy .The deposited films at room temperature were amorphous but the deposited films at 423K were polycrystalline structure. Optical parameters like absorption coefficient, energy gap, and refractive index

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... measured by the analysis of the experimental transmission spectrum over the wavelength range (200-1100) nm.