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- W2068458096 abstract "Abstract Different compositions of Bi 5 Ge x Se 95− x ( x = 30, 35, 40 and 45 at %) thin films were deposited onto cleaned glass substrates by thermal evaporation method. The structural characterization revealed that, the as-prepared films of x = 30, 35 and 40 at. % are in amorphous state but there are few tiny crystalline peaks of relatively low intensity for the film with x = 45 at. %. The chemical composition of the as-prepared Bi 5 Ge x Se 65− x films has been checked using energy dispersive X-ray spectroscopy (EDX). The optical properties for the as-deposited Bi 5 Ge x Se 65− x thin films have been studied. The additions of Ge content were found to affect the optical constants (refractive index, n and the extinction coefficient, k ). Tauc’s relation for the allowed indirect transition is successfully describing the mechanism of the optical absorption. It was found that, the optical energy gap ( E g ) decreases with the increase in Ge content. These obtained results were discussed in terms of the chemical bond approach proposed by Bicermo and Ovshinsky. The composition dependence of the refractive index was discussed in terms of the single oscillator model." @default.
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- W2068458096 date "2011-11-01" @default.
- W2068458096 modified "2023-09-24" @default.
- W2068458096 title "Compositional dependence of the optical parameters for Bi5GexSe65−x (30 ≤ x ≤ 45) films" @default.
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- W2068458096 doi "https://doi.org/10.1016/j.vacuum.2011.07.043" @default.
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