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Effect of Substrate Temperature on the Optical Properties of CdTe Thin Films
Mohamed Ibrahim ELSamahi, Wahib Attia and AbdulRahman Salem ALAgali
(1) Physics Department , Fac. of Science , Ismallia, Suez Canal Univ., Egypt
(2) Physics Department , Fac. of Science , Ismallia, Suez Canal Univ., Egypt
(3) Physics Department, Fac. of Education, ALGabal ALGharpy Univ., Kekla, Libya
ABSTRACT
CdTe thin films were prepared at different substrate temperatures (Tsub=473-573K) on glass by conventional vacuum evaporation method. Optical transmission spectra as a function of substrate temperature were studied. The optical band gap was determined at different isothermal temperatures .The results show that the optical gap decreases with increasing the specimen temperature according to: Eg (eV)=1.59-bTm (where b is a constant which depends on the substrate temperature and Tm in K), valid from 298 up to 423 k.
Key words: CdTe thin films , effect of substrate Temperature , Optical Properties
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