CDSE-SNO2 COUPLED SEMICONDUCTOR THIN-FILMS - ELECTROCHEMICAL AND PHOTOELECTROCHEMICAL STUDIES

The coupled OTE/SnO2/CdSe electrodes have been prepared by sequential deposition of SnO2 and CdSe colloidal films onto an optically transpar ent electrode (OTE), and their electrochemical and photoelectrochemica l properties have been studied. It is observed that coupling SnO, him with CdSe particles has extended its photoresponse into the visible. T he incident photon-to-photocurrent conversion efficiency (IPCE) for Cd Se film which is doubled when coupled with SnO2 him, shows a better ch arge separation in the coupled him. The cyclic voltammetric results of [Fe(CN)(6)](3-)/(4-) with OTE, OTE/CdSe and OTE/SnO2/CdSe electrodes suggest that the coupling of CdSe with SnO2 creates an energy barrier that hinders electron flow from SnO, to CdSe and into the electrolyte. Photocurrent stability of the cell employing OTE/SnO2/CdSe electrode has been improved by increasing the thickness of SnO2 particulate film . The photoelectrochemical performance of the cell has been evaluated and a net conversion efficiency of 2.25% has been obtained