Photoeffects in potassium tantalate

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Abstract
Photoeffects in high-resistivity samples of potassium tantalate having blocking metallic electrical contacts have been measured. We have observed photoconductive gains greater than unity and a rather broad spectral response. Examination of the photocurrent-voltage characteristic and the results of a series of photomasking experiments reveals that the photocurrent is limited by the junction resistance at low bias, and that a transition to bulk- (surface) limited conduction occurs as the bias is increased. We have evidence that multiple photomechanisms exist in this material. In the bulk-limited (high bias) regime, photodesorption of the surface is a contributing photomechanism.

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