Studying the effect of doping by Ag on the structural and optical properties of a-As₂Te₃ thin films

a-AS₂Te₃ was made of high purity elements that were productive. Thin film at a thickness (400 nm) was prepared using thermal evaporation techniques on cleaned glass substrates under very low vacuum (2×10⁻⁵mbar) with precipitation rate (0.33nm/s). The X-ray diffractometer showed that the pure film structure was amorphous, and the doping sample structure as polycrystalline. The result of optical properties has shown that pure and doping films have allowed a direct optical energy gap, and the energy gap for the pure film is (1.25eV) and decreases whenever we add impurities.