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IJPAP Vol.42(11) [November 2004] >


Title: Effect of Sn impurity on the photoconductivity of a- Se85Te15 thin films
Authors: Sharma, Vineet
Thakur, Anup
Chandel, Pradeep S
Madhok, G
Goyal, N
Tripathi, S K
Keywords: Chalcogenide glasses
Photoconductivity
Defects
Hopping
Issue Date: Nov-2004
Publisher: CSIR
IPC CodeG 01 R
Abstract: Temperature and intensity dependence of photoconductivity (σph) is studied in vacuum evaporated thin films of Se85Te15 and Se83Te15Sn2 with a view to see the effect of Sn impurity on the photoconductive behaviour of binary a-Se85Te15 alloy. Dark conductivity (σd) is also measured as a function of temperature. The dark conductivity, σd increases and activation energy (E) decreases after the addition of Sn impurity. σph decreases upon Sn incorporation. Rise of photocurrent shows a maximum before attaining the steady state value and this behaviour decreases after the addition of Sn impurity. Photosensitivity (σphd) also decreases. The results are explained in terms of the increase in the density of defect states on Sn incorporation in the Se85Te15 binary alloy.
Page(s): 845-848
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.42(11) [November 2004]

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