Nanostructured CdSe Thin Films Prepared by DC Plasma Sputtering

Abstract

In this work, nanostructured cadmium selenide (CdSe) thin films were deposited on glass substrates by dc plasma sputtering technique. The structural characterizations showed that the prepared samples were polycrystalline while the deposited CdSe films exhibited amorphous structure due to the growth of nanostructures on the substrates, which was also confirmed by the scanning electron microscopy. These films showed relatively high absorption in the ultraviolet and visible regions and low absorption in the NIR region. They have two allowed types of energy band gap; direct and indirect. The dispersion relationship showed that these films have a constant refractive index in the visible region, which is attributed to the optical homogeneity of the prepared films.