Abstract
The present paper reports the transient photoconductivity measurements in vacuum evaporated thin films of Se75Te20Ag5. It has been observed that under certain experimental conditions, the rise and decay of photoconductivity shows the anomalous behaviour. The photoconductivity increases initially, attains a maximum, and then decreases with time. Under the same experimental conditions, the decay of photocurrent shows a negative photoconductivity during the transient process, and then comes back to zero in many days. This anomalous behaviour of photoconductivity has been studied at various temperatures, by shining monochromatic light of different intensities and exposure times. The results have been explained on the basis of the interaction between photoexcited holes and Ag+ ions.
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