Abstract
The instability of the photocurrent in thin CDS films prepared by the electrohydrodynamic sputtering method is investigated. The degradation of photosensitivity of the films during prolonged illumination and the restoration of their photosensitivity in dark are explained by assuming the drift of ionized lattice defects in the field set up by negatively charged oxygen adsorbed on the surface of the crystallites. The spatial distribution of the potential in a crystallite is calculated, demonstrating a substantial change in the height and profile of the intercrystallite barriers as a result of the drift of defects.
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