Electrical properties of a-antimony selenide

TL;DR

This study investigates the electrical conduction mechanisms of a-antimony selenide across various temperatures and frequencies, revealing semiconducting behavior and different conduction processes such as band conduction, polaron, and bipolaron hopping.

Contribution

It provides detailed analysis of conduction mechanisms in a-antimony selenide over a wide temperature and frequency range, including the application of a modified CBH model.

Findings

Semiconducting behavior with activation energy of 0.42 eV.

Dominance of band conduction and polaron hopping above room temperature.

Bipolaron hopping dominates at lower temperatures.

Abstract

This paper reports conduction mechanism in a-\sbse over a wide range of temperature (238K to 338K) and frequency (5Hz to 100kHz). The d.c. conductivity measured as a function of temperature shows semiconducting behaviour with activation energy $\Delta$E= 0.42 eV. Thermally induced changes in the electrical and dielectric properties of a-\sbse have been examined. The a.c. conductivity in the material has been explained using modified CBH model. The band conduction and single polaron hopping is dominant above room temperature. However, in the lower temperature range the bipolaron hopping dominates.