Effect of Te addition into As₂Se₃ thin film: Optical property study by FTIR and XPS

In the present work, we report the effect of Te deposition onto As₂Se₃ film which affects the optical properties. The Te/As₂Se₃ film was illuminated with 532 nm laser to study the photo induced diffusion. The prepared As₂Se₃, Te/As₂Se₃ films were characterized by X-ray diffraction which show a completely amorphous nature. On the basis of optical transmission data carried out by Fourier Transform infrared Spectroscopy, a non direct transition was found for these films. The optical bandgap is found to be decreased with Te deposition and photo darkening phenomena is observed for the diffused film. The change in the optical constants are also supported by the corresponding change in different types of bonds which are being analyzed by X-ray photoelectron spectroscopy