Abstract

It has been proposed that the conductivity decrease induced by photochemical reactions can be ascribed to a supplementary recombination which was considered in the reaction kinetics model as an effective recombination center. In order to obtain data on the mechanism of this supplementary recombination, investigations were made on the quenching of the photoconductivity by infrared radiation and the spectral distribution and the intensity dependence of the photoconduction in connection with photochemical reactions. The quenching spectra of very pure CdS crystals and of Fe-activated crystals at 20 and - 180 deg C were measured with and without photochemical reaction products and without photochemical reaction products with reduced excitation intensity. (J.S.R.)

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