Comparison of photovoltaic and photoconductive effects in insulating CdS crystals

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Abstract
Photovoltage measurements with insulating CdS crystals capacitively coupled to the external circuit have been performed at room temperature in 1 atm oxygen and 10−8 Torr vacuum, and at 100 K at 10−8 Torr vacuum, and have been interpreted self consistently with photoconductivity measurements. It was found that the Dember voltage is about 0.06 V at room temperature and 0.02 V at 100 K, that the oxygen chemisorption-induced surface barrier is at least 0.15 eV at room temperature, and that photoconductivity measurements are a valuable tool in the self-consistent interpretation of photovoltage measurements on an insulating specimen.

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