Synthesis and Characterization of Nanostructural Cds Thin Film Using Spin Coating Technique for Photodetector Application

This article, thin films of cadmium sulfide nanocrystals (CdS) were prepared by "Spin Coating" technology deposited on the glass substrates with various concentrations of Cd and S (0.5, 0.75, 1, 1.25) M. The structural characteristics of the prepared film were characterized using the X-ray diffraction "XRD", The Scanning electron microscope with field emission (FE-SEM)", the atomic force microscope (AFM), and the optical properties with UV-Visible measurement . The thin film with a concentration of (1M) has good structural and optical properties that reveal desirable for photovoltaic applications. The "XRD" revealed that all films have a cubic phase structure, with diffraction peaks of (111), (220), and (311), respectively, at 2 = 26, 43, and 51 for the deposit) the preferred orientation of its peak (111) at 2 = 26.In addition, high intensities of peaks in film concentration of 0.75 M have been observed due to high crystallinity, low crystalline size, and roughness. However, The 1 M film concentration exhibits a lower crystallinity, a small crystalline size, and a high roughness. According to the FE-SEM, The nanospheres uniformly shape the structure that has been formed throughout the whole substrate surface, and There are no fractures or pinholes in any of the Cadmium-Sulfide films, and they are uniform and neatly wrapped around the substrate. A thin layer (1 M) with a uniform absorption spectrum for all visible wavelengths has a high absorption spectrum, according to the optical characteristics. The absorption values of the thin sheet (1M) are substantial. In the viewable range, all films are transparent, according to this study. The energygap increases with the decreases in molarity, and the measured energy gap is in good agreement with the energy-gap bulk.