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|Title:||Persistent photoconductivity in a-Se<sub>90</sub>Ge<sub>10-x</sub>In<sub>x </sub>thin films|
Shukla, R K
|Abstract:||Transient photoconductivity has been studied in amorphous Se<sub>90</sub>Ge<sub>10-x</sub>In<sub>x </sub>thin films prepared by vacuum evaporation. It is observed that the decay of photoconductivity is quite slow in these samples. A persistent photoconductivity, with an extremely slow decay rate is also observed during decay process. The magnitude of persistent photoconductivity increases with increase in illumination time, intensity of light and temperature of the films. The results indicate that some kind of photo induced structural changes occur in these samples, which are of reversible nature and have time constants of a few hours. Studies made on various compositions under identical conditions show that the persistent photoconductivity is minimum at 4 at. % of Indium. This discontinuity at an average coordination number < Z >= 2.2 is closer to the value suggested by topological models based on constraints theory.|
|ISSN:||0975-1017 (Online); 0971-4588 (Print)|
|Appears in Collections:||IJEMS Vol.12(5) [October 2005]|
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