Extension of Spectral Response of p‐Type Gallium Phosphide Electrodes by Metal Adatoms

Abstract

The spectral response of p‐type electrodes was successfully extended to longer wavelengths by depositing a monolayer of any of several kinds of metal such as gold, silver, palladium, or copper onto the electrode surface and then cathodically polarizing the electrode under illumination. The shape, but not the magnitude, of the developed photocurrent spectra, which covered wavelengths between 600 and 1400 nm, were independent of the kind of metal chosen. Impregnated hydrogen seemed to be responsible for the enhanced photocurrent spectra.