Structural, Optical and Electrical Properties of Cadmium Sulphide Thin Films Deposited by Spray Pyrolysis Technique

Abstract

At a substrate temperature of 400^o C, spray pyrolysis was used to create thin films of cadmium sulphide with varying molar concentrations. The physical properties of the films were studied as a function of the increase in molar concentration at 0.3, 0.5, 0.7, and 1 M respectively. The films were characterized by different techniques to study their structural, optical, and electrical properties. The X-ray diffraction analysis revealed that the films were polycrystalline in nature. However, when the molar concentration was increased above 1 M, the crystalline quality and the preferential orientation of films deteriorated. Optical measurements showed that the band gap values decreased from 2.6 to 1.8 eV with increasing molar concentrations of 0.3, 0.5, 0.7, and 1 M, respectively. The photoluminescence spectra displayed that all the samples have an emission peak centred at 750 nm. The morphological studies of HR-SEM and HR-TEM from spherical shaped structures and EDX analysis confirm that the metal chalcogenide thin film is metal. The main application of dye-sensitized solar cells with an increase in mole concentration of 0.3, 0.5, 0.7, and 1 M respectively, with an increase in current in short short-circuit density.