IRRADIATION EFFECT IN CdSe THIN FILMS

Abstract

Cadmium selenide thin films of thickness 200 nm were thermally deposited by vacuum evaporation method at room temperature on glass ground. The effects of irradiated time on the structure and optical characteristic of these films were studied. The films are hexagonal structure confirmed by XRD analysis. XRD pattern of the irradiated film at 72 hour shows an improvement of crystallinity. The optical measurements of CdSe films were carried out in the wavelengths range from 300-900 nm. The transmitance spectra shows that irradiated samples are less transmittance than non – irradiated one. The increase in irradiated time leads to a decreases in energy band gaps from 2.49 eV to 2.33 eV.