Photoelectrochemical Properties of Double Layer Photoelectrode of Cadmium Chalcogenides Prepared by Vacuum Evaporation

Double layer thin films were prepared using two kinds of cadmium chalcogenides by vacuum evaporation. The double layer films showed different photoelectrochemical properties from those of single layer electrodes. Onset potentials of CdSe / CdS and CdTe / CdSe electrodes shifted negatively from those of CdSe and CdTe single layer electrodes. The CdSe / CdTe electrode functioned under irradiation of longer wavelengths than the CdSe electrode did, and it was more stable than the n ‐ CdTe electrode was.