Preparation and characterization of structural and optical properties of CdS thin film spin coating prepared

Abstract In this paper, a Cadmium sulphide (CdS) nanocrystal thin film has been prepared on glass substrate using the sol-gel method. As deposit and effect annealing films at an annealing temperature of 500°C for 1hour were investigated and characterized. The characterization of prepared films included, structural properties using X-ray diffraction (XRD), Scanning electron microscope (SEM), Atomic force microscope (AFM), and optical Properties using UV-Visible measurement. based on XRD results the annealing reason increase in peak intensity due to the improvement in the crystallinity and the crystalline size decreased with increasing the annealing temperature in regrading of preferred diffraction peak (111) at 2 θ =26 to be fourth more, this indicated a formation of cubic structure of the CdS nanocrystalline thin films as the predominant phase. When the dislocation density and strain initially decreased with increasing the annealing temperature due to the improvement of crystallization. SEM images revealed that the films have Nano sphere-based or cluster-like shape and the structure uniformly grown on the substrate have been observed with annealing temperature. Besides, the roughness, root mean square(RMS), and average diameter. decreased while the grain size increased with annealing temperature. The optical properties showed that the films have low absorption over the visible region and it’s decreasing the annealing temperature which makes the CdS is a promising material for optoelectronic application. The energy gap increases with a decrease in the size of the crystallites, while an energy gap value is somewhat larger than the typical value of bulk CdS. This may be due to the quantum confinement effect due to the nanometer crystallite size of the cadmium sulphide thin film. The first section in your paper.