Electrosynthesis, photoelectrochemical and corrosion studies on (CdIn) Se, (CdGa) Se thin films

Abstract

Electrosynthesis of indium and gallium containing CdSe thin films on titanium substrate by electrochemical codeposition method has been studied using aquous electrolytic bath at room temperature. The stoichiometry of electrodeposited films could be varied using different concentrations of indium and gallium in the electroplating solution. Photoelectrochemical properties of the electrosynthesised films have been reported. Charge carrier densities and flat –band potentials of the film electrodes have been determined from the capacitance measurements. Current-voltage behaviour of the electrodeposited films has been studied for the estimation of corrosion characteristics in the I₂/I₃ redox solution. Possibility of containment of corrosion using inhibitor has also been explored. The incorporation of indium and gallium during deposition of CdSe thin films enhances photoactivity and reduces corrosion rate. EDAX and SEM analyses have been used for compositional and surface characterisation of the films.