The role of Ag layer in the optical properties of CdS thin film

Abstract

CdS and CdS capped with Ag thin layer thin films were organized by chemical bath deposition technique. Cadmium chloride and thiouria were used as precursors material to deposited CdS film at 80 C. after deposition of CdS film, it dipped in Ag NPs. precursors for one hour at 50 C to coated it surface by Ag layer. In this paper, we examined the absorbance in the range between 300 and 1100 nm. The direct and indirect band gaps were calculated with the Tauc method, yielding values of 1.97 to 2.46 eV. Resulting noticeable decreasing in band gaps with the presence of Ag layer.