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Effect of Ag impurity on photoconductive properties of selenium-tellurium glasses

R. S. SHARMA1, R. K SHUKLA1, A. KUMAR1,*

Affiliation

  1. Department of Physics, Harcourt Butler Technological Institute, Kanpur – 208002, India

Abstract

The paper reports the effect of silver impurity on photoconductive properties of selenium-tellurium glassy system. Steady state and transient photoconductivity is reported in Se-Te glassy alloy with and without silver impurity. The dark conductivity of Se70Te30 increase, while activation energy is found to decrease with silver concentration. Photosensitivity also decreases with silver impurity. It has been observed that under certain experimental conditions, the transient measurement shows anomalous behaviour (i.e. peak in photoconductivity and negative photoconductivity in rise) in samples having Ag impurity. The recovery process of transient photoconductivity also takes a long time in Ag contained samples. This anomalous behaviour of photoconductivity has been studied at various temperatures and various illumination times. The results have been explained on the basis of the interaction of Ag+ ions and photo-excited holes..

Keywords

Chalcogenide glasses, Transient photoconductivity, Amorphous thin films.

Submitted at: Oct. 9, 2007
Accepted at: Dec. 7, 2007

Citation

R. S. SHARMA, R. K SHUKLA, A. KUMAR, Effect of Ag impurity on photoconductive properties of selenium-tellurium glasses, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 12, pp. 3760-3764 (2007)