Physical and Spectroscopic Characterization of Chemically Deposited Cd1-xMnxs Thin Films

Abstract

Chemical bath deposition technique (CBD) was used for deposition of Cd1-xMnxs Thin Films. Initially bath parameters were optimized by physical observation of sustainable Deposition of CdS thin films. The deposited films have been characterized by using X-ray diferactometer, Scanning electron microscopy, EDAX and spectrophotometer. The film thickness was estimated using weight and difference method. Film thickness was found increased with increase in Mn concentration in CdS material. All the films show polycrystalline crystal structure. The observed diffraction patterns were well fitted with the standard JCPDS card data: 772306 of CdS and 76-2049 for MnS. Cd1-xMnxS thin films exhibit the hexagonal as well as cubic crystal structure. The micrograph shows that the films deposited cover the whole substrate with uniform surface morphology. The significant effect of Mn doping has been observed from SEM micrographs of the CdxMn1-xS thin film. Very small amount of Mn doping can show significant change in the microstructure of the SEM. The nanowire morphology was found changed into granular morphology. The absorption spectra show significant blue shifting for the composition x=0.8, having very low absorption. The optical transmittance was higher in the visible region (350 900 nm) and was found increased from 5 to 68 %. The optical band gap was found increased on Mn doping. The x=0.8 exhibit 3.58eV band gap. The maximum transmittance and higher band gap shows that Cd0.2Mn0.8S Composition can be used for solar cell applications.