Temperature Dependent Optical and Morphological Properties of Sb2Te3 Thin Films

Sb2Te3 thin films of different temperature ranging from room temperature to 200°C were prepared on glass substrate by thermal evaporation method. The effects of temperature on optical and morphological properties of thin films were studied. AFM images indicated crystalline nature of Sb2Te3. The optical properties exhibited a decreasing trend of band gap from 1.24eV to 1.06eV with increase in temperature. Transmittance decreased as the temperature was increased and displayed no transmittance in the visible range at 200°C. Surface roughness decreased up to 150°C after which it increased