Effect of In-content on the optical properties of a-Se films |
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Authors: | MF Kotkata FA Abdel-Wahab MS Al-Kotb |
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Institution: | aSemiconductors Technology Lab, Faculty of Science, Ain Shams University, Cairo 11566, Egypt |
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Abstract: | The optical transmission spectra of amorphous (a-) Se1−xInx films, with x = 0.0, 0.05, 0.18 and 0.35, that prepared by thermal evaporation from their corresponding bulk ingots, are recorded over the spectral region of 500–2500 nm. A simple straight forward procedure proposed by Swanepeol has been applied to determine the two components of the complex refractive index ( ). The dispersion of is examined in terms of the Wemple and DiDomenico model and is discussed in terms of In-content. An estimation of various optical parameters such as, the optical energy gap (Eg = 1.96–1.33 eV), single oscillator energy (Eo = 3.95–3.16 eV), oscillator dispersion energy (Ed = 22.6–31.6 eV), lattice oscillator strength (El = 0.38–0.61 eV) and wavelength at zero material dispersion (λc = 2.0569–2.0879 μm) have been given and discussed in relation to the coordination number, hydrostatic density and formed chemical bonds that are introduced in the network of a-Se with the introduction of up to 35 at.% In. |
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Keywords: | Amorphous semiconductors Chalcogenides Optical properties Thin films Se– In |
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