Thermoelectric power of CdTe thin films prepared by vacuum evaporation method. | [Nucleus • 2002]

Author(s):

1. M. Mozibur Rahman: Department of Physics, University of Rajshahi, Rajshahi, Bangladesh

2. M. K . R. Khan: Department of Physics, University of Rajshahi, Rajshahi, Bangladesh

3. Y. Zaman: Department of Physics, University of Rajshahi, Rajshahi, Bangladesh

4. M . O. Hakim: Department of Physics, University of Rajshahi, Rajshahi, Bangladesh

5. M. G. M. Choudhury: Department of Physics, University of Rajshahi, Rajshahi, Bangladesh

Abstract:

Cadmium Telluride (CdTe) thin films of different thickness have been prepared by vacuum evaporation method on glass substrate at room temperature. X-ray diffraction and thermoelectric power (TEP) measurements were carried out on these films. The XRD pattern shows that as-deposited films are amorphous in character. Thermoelectric power (TEP) measured from room temperature to 450 k and it shows positive value at room temperature and decreases with the increase of temperature upto T~314 K, above which it remains almost constant. At higher temperature T > 410 K, TEP becomes negative. These experimental results reveal that there are two types of carriers present in as-deposited films. In low temperature region, dominant carriers are holes and at high temperature (T > 410 K) it is electron. The activation energy Eo and temperature coefficient of activation energy γ have been calculated from TEP data. Eo and γ varies with film thickness and their values range from 0.52 to 1.21 eV and 7.05 ×10-4 to 18.4 × 10-4 eVK-1 respectively. It is found that TEP does not vary systematically with film thickness, which is one of the characteristics of amorphous materials reported in the next.

Page(s): 137-143

DOI: DOI not available

Published: Journal: Nucleus, Volume: 39, Issue: 3--4, Year: 2002

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