Abstract
The action of chemisorbed oxygen on photoconductivity in highly insulating CdS-monocrystals has been studied. For all wavelengths, the photosensitivity is increased by several orders of magnitude after desorption by electron bombardment. The intensity dependance of the photo-current is sublinear for a clean crystal surface. With chemisorbed oxygen at the surface, the intensity dependance is linear and supralinear. The experimental results are accounted for by means of a theory of Stöckmann. Finally it is shown that quenching characteristics are also affected by surface states.
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