Abstract
The contact potential difference (CPD) between CdS and Au and the open circuit voltage (OCV) in the direction of c-axis were measured simultaneously on photoconductive insulating CdS crystals with a polar surface. As a result, it was concluded that large changes in CPD produced in response to changes in the pressure of the environment in the dark are due to the piezoelectric effect of the crystals. The changes in CPD produced by changes in temperature from 90 K to 400 K in the dark were also measured on the same crystals and such changes could be accounted for by the generation of pyroelectricity. Moreover, the pyroelectric characteristics were found to show good correspondence to the results of the measurement of the thermally stimulated current in a previous paper.
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