Structural and optical properties of In 35Sb 45Se 20− xTe x phase-change thin films

Abstract

Physical properties of In 35Sb 45Se 20− x Te x thin films with different compositions ( x=2.5, 5, 7.5, 10, 12.5 and 15 at %) prepared by electron beam evaporation method are studied. X-ray diffraction results indicate that the as-evaporated films depend on the Te content and the crystallized compounds consist mainly of Sb 2Se 3 with small amount of Sb 2SeTe 2. Transmittance and reflectance of the films are found to be thickness dependent. Optical-absorption data indicate that the absorption mechanism is direct transition. Optical band gap values decrease with increase in Te content as well as with increase in film thickness.