High Field Conduction in a-Se75In21Pb4 Thin Films: Applicability of Meyer-Neldel Rule

概要

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In general, in case of semiconductors, conductivity ($\sigma$) varies exponentially with temperature ($T$), i.e., $\sigma=\sigma_{0}\exp[-\Delta E/kT]$ where $\Delta E$ is the activation energy and $\sigma_{0}$ is called the pre-exponential factor. In most of the semiconducting materials, $\sigma_{0}$ does not depend on $\Delta E$. However, in many organic and amorphous semiconductors, $\sigma_{0}$ is found to increase exponentially with $\Delta E$. This is called Meyer-Neldel rule. In such experiments, the activation energy is changed by changing composition of the glassy sample. In the present work we have changed $\Delta E$ 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. The implications of these results have also been discussed in the present paper.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-03-15