Synthesis and Characterization of Cadmium Selenide Thin Films

Abstract

Crystalline cadmium selenide thin film has been deposited using appropriate precursor solution containing cadmium sulphate octahydrate, triethanolamine, sodium hydroxide, ammonia solution and sodium selenosulphate. The effect of parameters such as bath composition, deposition temperature, pH of solution, speed of the rotation and the specificity of complexing agent on growth process is studied. The grown films were found to be uniform, well adherent to the glass substrate and specularly reflective. The crystalline phase of the deposited sample was hexagonal wurzite type. The analysis of optical absorption data shows energy band gap energy (E_g) 2.18 eV. The morphological study and compositional analysis of film sample have been discussed. The electrical resistivity of CdSe thin film was found to the order of 10^-6 (W cm^-1).