Abstract
Vitreous arsenic-selenium photoconductors have been observed to age with resultant decreases in spectral sensitivity, dark discharge rate, and residual potential. The first two changes are attributed to surface oxidation of arsenic and the residual potential decrease to a bulk phenomenon. Vitreous selenium photoconductors also exhibit a decrease in dark discharge rate while aging. Removal of the surface layer of an aged As-Se film restores the dark discharge rate and spectral sensitivity to virgin values. Various techniques have demonstrated a change in surface morphology while aging. The effects of atmosphere and temperature on the rate and extent of aging support the surface oxidation model.
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