Conduction mechanism of a-As2Te3

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Abstract
The electrical DC conductivity, photoconductivity, dark thermopower, and photothermopower of a-As2Te3 have been determined in the temperature range 170K to 360K. The photo-equilibrium measurements suggest that although unipolar (holes) action dominates the conduction process throughout the investigated temperature range, the small value of the ratio of hole to electron mobilities will favour ambipolar conduction should the system be subject to slight external disturbance. Photoconductivity and photothermopower measurements confirm this suggestion. The data on photothermopower are the first reported investigations, which reveal that within the temperature range 320K to 200K, the phonon-drag contribution is significant. However, the positive nature of the photothermopower confirms that the existing photoconductivity theory of a-As2Te3 assuming the material as p-type is correct.

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