Optical properties of amorphous films |
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Authors: | El-Sayed M. Farg |
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Affiliation: | Basic Science of Engineering Department, Faculty of Engineering, Minufiya University, Shebin El-kom, Egypt |
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Abstract: | We have analyzed the optical properties of a-Ge30-xSbxS70 chalcogenide glass films (x=0,10,20 and 30 at%); the chalcogenide films were prepared by vacuum thermal evaporation. The optical-absorption data indicate that the absorption mechanism is non-direct transition. We found that the optical band gap, Eopt, decreases from 2.04±0.01 to 1.74±0.01 eV, whereas the refractive index increases with increasing Sb content. Data are analyzed by the Wemple equation, which is based on the single-oscillator model. |
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Keywords: | Amorphous Ge, Sb, S thin films Optical |
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