Analytical investigations of CdS nanostructures for optoelectronic applications

Cadmium sulfide (CdS) nanostructures were prepared and deposited on glass substrates of Cd:S (1.2–0.05 mol/L) annealed at 400 °C with different spin coating speed (1000, 3000 and 5000 rpm) using spin coating technique. Structural, morphological and analytical studies were investigated by X-ray diffraction (XRD), atomic force microscopy (AFM), Fourier transform infrared (FTIR) and UV–Vis Spectroscopy. It is found that the particle size of CdS nanostructures is 1.40, 1.78 and 2.31 nm prepared at 1000, 3000 and 5000 rpm, respectively. The band gap was measured with an indication of transmission within the visible range; it is changed due to particle size of CdS nanostructures. The calculated refractive index and optical dielectric constant results give agreement with experimental results. The obtained results are in accordance with experimental and theoretical data.