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Title: Effect of Sn impurity on the photoconductivity of a- Se<sub>85</sub>Te<sub>15</sub> thin films
Authors: Sharma, Vineet
Thakur, Anup
Chandel, Pradeep S
Madhok, G
Goyal, N
Tripathi, S K
Keywords: Chalcogenide glasses
Issue Date: Nov-2004
Publisher: CSIR
Series/Report no.: G 01 R
Abstract: Temperature and intensity dependence of photoconductivity (σ<sub>ph</sub>) is studied in vacuum evaporated thin films of Se<sub>85</sub>Te<sub>15</sub> and Se<sub>83</sub>Te<sub>15</sub>Sn<sub>2</sub> with a view to see the effect of Sn impurity on the photoconductive behaviour of binary a-Se<sub>85</sub>Te<sub>15</sub> alloy. Dark conductivity (σ<sub>d</sub>) is also measured as a function of temperature. The dark conductivity, σ<sub>d </sub>increases and activation energy (<img src='/image/spc_char/delta.gif' border=0><i style="">E</i>) decreases after the addition of Sn impurity. σ<sub>ph </sub>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 (σ<sub>ph</sub>/σ<sub>d</sub>) also decreases. The results are explained in terms of the increase in the density of defect states on Sn incorporation in the Se<sub>85</sub>Te<sub>15</sub> binary alloy.
Description: 845-848
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.42(11) [November 2004]

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