CdS Thin Film using a Simple Technique

Abstract

Cadmium sulphide (CdS) thin film is synthesized chemically using a simple spray pyrolysis method. CdS solution is prepared from the chemical solution mix of cadmium chloride and thiourea in the ratio of 3:2. The solution is diluted to 0.1M concentration using deionized water and is sprayed using a spray can on a clean glass substrate placed on a hotplate. The thin film deposited on the glass substrate is characterized for structural analysis using X-ray diffraction spectrometer confirming hexagonal structure. XRD data is compared with JCPDS data card. A good agreement is established. The Surface morphology and chemical composition of CdS thin film is characterized using Tescan Vega 3 energy dispersive X-ray spectrometer cum scanning electron microscope. The energy dispersive X-ray spectrum confirms the presence of sulphur K X-ray peak and cadmium X-ray peaks in different concentration of the CdS film deposited. Absorbance and transmittance of UV-VIS radiation in the deposited film is studied and the optical bandgap is calculated to be 2.45eV from the Tauc plot. An uncertainty of less than 2% is reported in the present work over other standard methods.