Abstract
Measurements of the conductivity, photoconductivity and photovoltage have been made on photoconducting cadmium sulphide crystals with evaporated indium contacts. Changes in the electrical properties of this system due to mild heat treatment are ascribed to changes in the contact resistance and the accompanied change in the effective value of the surface recombination velocity at the metal-photoconductor interface. A model is presented to account for the observed reversal in the sign of the photovoltage following heat treatment and to explain the sensitivity of the photovoltage to the ambient atmosphere.
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