Deposition Angle Effect on the Optical Properties of Obliquely Deposited (SnTe) Thin Films Prepared by Thermal Evaporation

Abstract

The Tin Telluride thin films of obliquely and normal deposited were prepared using thermal evaporation method at pressure of 10-6 torr on glass substrates at room temperature. The optical band gap of films has been determined from the transmission and absorption spectra. The optical band gap of as-grown films has been found to have direct band gap of ~(1.8, 1.62, 1.47) eV for deposition angle θ = (0 ̊ , 40° , 70 ̊ ) respectively. The optical band gap of SnTe thin films decreases with angle of deposition increases.