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Heat-treatment effect on the structural and optical propertiesof flash evaporated Sb2Te3 thin films

Published online by Cambridge University Press:  06 August 2008

H. S. Soliman ,
S. Yaghmour  and
H. G. Al-Solami
H. S. Soliman*
Affiliation:
Physics Department, Girl's College, King Abdul Aziz University, Jeddah, Saudi Arabia
S. Yaghmour
Affiliation:
Physics Department Faculty of Science, King Abdul Aziz University, Jeddah, Saudi Arabia
H. G. Al-Solami
Affiliation:
Physics Department, Girl's College, King Abdul Aziz University, Jeddah, Saudi Arabia
*
[email protected]
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Abstract

The effect of thickness and heat treatment on the structural and optical properties of Sb2Te3 thin films fabricated by using flash evaporation technique were investigated. The as-deposited films were found to be stoichiometric. For the as-deposited and annealed samples of thickness in the range of 20.7–120.5 nm, large variations in transmittance and reflectance were observed for wavelength below 2000 nm due to strong absorption, while slight variations were observed above 2000 nm. The optical constants, n and k, measured in the range of 500–4000 nm, increased slightly by annealing the samples at 573 K for 2 h in air and a red shift was observed. Allowed indirect transitions were observed for the as-deposited and the annealed samples. The results showed two energy gaps for these transitions varied from 0.28 to 0.31 eV for the as-deposited samples and from 0.56 to 0.54 eV for the annealed films. The spectral distribution of the real part of the dielectric constant ε′ showed a maximum at 0.73 eV for the as-deposited films decreased to 0.65 eV by annealing.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 44 , Issue 1: 10th Meeting of the French Microscopy Society (SFMU) , October 2008 , pp. 59 - 64
Copyright
© EDP Sciences, 2008

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