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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.42 [2004] >
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 Code: | G 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 (σph/σd) 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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