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|Title:||High field conduction in amorphous thin films of Se<sub>70</sub>Te<sub>30</sub><sub>-x</sub>Cd<sub>x</sub> in dark and in the presence of light|
|Authors:||Kushwaha, V S|
High field conduction
|Abstract:||Glassy alloys of Se<sub>70</sub>Te<sub>30</sub><sub>-x</sub>Cd<sub>x</sub> (<i style="">x</i> = 2, 4, 6) are prepared by the quenching technique. Amorphous thin films of these alloys are prepared by the vacuum evaporation technique. Current–voltage (<i style="">I-V</i>) characteristics have been studied at various temperatures in the films in dark and in the presence of light. For this purpose, a <i style="">dc</i> voltage (0 – 300 V) was applied across the film. <i style="">I-V</i> characteristics show that, at low electric fields, an ohmic behaviour is observed. However, at high electric fields (<i style="">E</i> ~ 10<sup>4</sup> V/cm), the current becomes super ohmic. Analysis of the data shows the absence of space charge limited currents in amorphous Se<sub>70</sub>Te<sub>30</sub><sub>-x</sub>Cd<sub>x</sub> thin films as ln I/V versus <i style="">V</i> curves are not found to be straight lines with high correlation coefficient. Instead, ln <i style="">I</i> versus <i style="">V</i><sup>1/2</sup> curves are found to be straight lines having high correlation coefficient. The slope of these curves decreases with the increase in temperature. A more detailed analysis shows that the dominant mechanism of conduction is of Poole-Frenkel type in dark as well as in the presence of light.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.43(08) [August 2005]|
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