Photoconductive particles of zinc oxide

摘要

An improved photoconductive surface coating is provided having panchromatic sensitivity and increased resistance against spectral response shift upon reuse of the photoconductive layer. The surface coating comprises zinc oxide particles, a minor amount of a group IIB selenide or telluride and a binder in substantially uniform mixture. The selenide or telluride is chemically deposited on the zinc oxide particles. The resulting particles exhibit bi-chargeability and substantially increased light sensitivity. The selenide or telluride can be deposited chemically in accordance with one embodiment by dispersing zinc oxide particles in a medium such an water and precipitating the selenide or telluride, preferably in situ, on the surface of the particles.