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HIGH FIELD CONDUCTION IN a- Se70Te30-XCdX THIN FILMS: APPLICABILITY OF MEYER-NELDEL RULE

V. S. Kushwaha1, N. Mehta1, N. Kushwaha1, A. Kumar1,*

Affiliation

  1. Department of Physics, Harcourt Butler Technological Institute, Kanpur-208 002, India

Abstract

In general, in case of semiconductors, conductivity (s) varies exponentially with temperature (T), i.e., s = s0 exp (- DE / k T) where DE is the activation energy and s0 is called the pre exponential factor. In most of the semiconducting materials, s0 does not depend on DE. However, in many organic and amorphous semiconductors, s0 is found to increase exponentially with DE. This is called Meyer- Neldel rule. In such experiments, changing composition of the glassy sample changes the activation energy. In the present work we have changed DE by applying high electric fields. It is shown that Meyer- Neldel rule is obeyed in this case also where composition of the material is not changed. This indicates that this rule is more general in chalcogenide glasses and is not due to changes in certain parameters on changing composition..

Keywords

Chalcogenide glasses, Meyer-Neldel rule, High field conduction.

Submitted at: May 5, 2005
Accepted at: July 21, 2005

Citation

V. S. Kushwaha, N. Mehta, N. Kushwaha, A. Kumar, HIGH FIELD CONDUCTION IN a- Se70Te30-XCdX THIN FILMS: APPLICABILITY OF MEYER-NELDEL RULE, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 4, pp. 2035-2040 (2005)