Effect of temperature on the optical parameter of amorphous Sb-Se thin films

Thin films of a-Sb(x)Se(1-x) (x=0.,0.,0.6) are prepared by vacuum evaporation technique onto glass substrates. The amorphous nature of as deposited thin films has been checked by XRD technique. The transmittances of the films are measured at various temperature ranges 100-400K in the wavelength rang...

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Bibliographic Details
Published in:Journal of Optoelectronics and Advanced Materials 2009-12, Vol.11 (12), p.2019-2023
Main Authors: Mustafa, Falah I, Gupta, Shikha, Goyal, N, Tripathi, S K
Format: Article
Language:English
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Summary:Thin films of a-Sb(x)Se(1-x) (x=0.,0.,0.6) are prepared by vacuum evaporation technique onto glass substrates. The amorphous nature of as deposited thin films has been checked by XRD technique. The transmittances of the films are measured at various temperature ranges 100-400K in the wavelength range 400-1100 nm. Optical absorption obeyed the indirect transition process. The temperature dependence of the optical energy gaps in this range are fitted with four equations beginning with linear, non linear, Varshni and Bose Einstein equations. The results are best fitted with the Varshni equation. We have found that the energy gap decreases with the increase in Sb percentage in these thin films and an increase in energy gap with the decrease of temperature.
ISSN:1454-4164