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Study of the optical properties of amorphous As–Se–S thin films

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Abstract

This study investigates the effects of substitution of selenium by sulfur on the optical constants of amorphous (a-)As20Se80 − xSx films (x = 0, 4, 8, 12, 16, and 20 at%), where the coordination number for both Se and S is the same. The absorption coefficient, α, and the index of refraction, n, were derived using the transmission spectra in a wide range of wavelengths from 400 to 2500 nm. This revealed that the index of refraction for the a-As20Se80 − xSx system decreases with increase in sulfur content throughout the range under study. The effective coordination number of As has been determined based on the refractive index dispersion analysis. A decreasing in Nc from 4.022 to 3.752 with increase content of sulfur from 0 to 20 at% has been recorded. In addition, the optical bandgap, Eg, of the a-As20Se80 − xSx thin films increases with increase in S content which can be explicated in terms of the chemical bond approach.

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Acknowledgements

The author (H. H. Hegazy) gratefully thank the Deanship of Scientific Research at King Khalid University for the financial support through research groups program under grant number (R.G.P.1/57/39).

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Authors and Affiliations

  1. Department of Physics, Faculty of Science and Arts Khulais, University of Jeddah, Khulais, Saudi Arabia

    Kamal A. Aly

  2. Department of Physics, Faculty of Science, Al-Azhar University, Assiut branch, Assiut, 71524, Egypt

    Kamal A. Aly & Y. Saddeek

  3. Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia

    H. H. Hegazy, A. Dahshan & Atif Mossad Ali

  4. Department of Physics, Faculty of Science, Port Said University, Port Said, Egypt

    A. Dahshan

  5. Department of Chemistry, Faculty of Science, Al-Azhar University, Assiut branch, Assiut, Egypt

    Kh. S. Shaaban

  6. Department of Physics, Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia

    S. R. Alharbi

  7. Department of Physics, Faculty of Science, Assiut University, Assiut, Egypt

    Atif Mossad Ali & S. A. Amin

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  1. Kamal A. Aly
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Aly, K.A., Hegazy, H.H., Dahshan, A. et al. Study of the optical properties of amorphous As–Se–S thin films. Appl. Phys. A 124, 868 (2018). https://doi.org/10.1007/s00339-018-2278-x

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