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IJPAP Vol.43(08) [August 2005] >


Title: High field conduction in amorphous thin films of Se70Te30-xCdx in dark and in the presence of light
Authors: Kushwaha, V S
Mehta, N
Kumar, A
Keywords: Chalcogenide glasses
Amorphous semiconductors
High field conduction
Poole-Frenkel effect
Thin films
Issue Date: Aug-2005
Publisher: CSIR
IPC CodeH01L
Abstract: Glassy alloys of Se70Te30-xCdx (x = 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-V) characteristics have been studied at various temperatures in the films in dark and in the presence of light. For this purpose, a dc voltage (0 – 300 V) was applied across the film. I-V characteristics show that, at low electric fields, an ohmic behaviour is observed. However, at high electric fields (E ~ 104 V/cm), the current becomes super ohmic. Analysis of the data shows the absence of space charge limited currents in amorphous Se70Te30-xCdx thin films as ln I/V versus V curves are not found to be straight lines with high correlation coefficient. Instead, ln I versus V1/2 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.
Page(s): 630-635
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.43(08) [August 2005]

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