Applied Physics A

, 124:868 | Cite as

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

  • Kamal A. Aly
  • H. H. Hegazy
  • A. Dahshan
  • Kh. S. Shaaban
  • Y. Saddeek
  • S. R. Alharbi
  • Atif Mossad Ali
  • S. A. Amin


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.



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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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Kamal A. Aly
    • 1
    • 2
  • H. H. Hegazy
    • 3
  • A. Dahshan
    • 3
    • 4
  • Kh. S. Shaaban
    • 5
  • Y. Saddeek
    • 2
  • S. R. Alharbi
    • 6
  • Atif Mossad Ali
    • 3
    • 7
  • S. A. Amin
    • 7
  1. 1.Department of Physics, Faculty of Science and Arts KhulaisUniversity of JeddahKhulaisSaudi Arabia
  2. 2.Department of Physics, Faculty of ScienceAl-Azhar UniversityAssiutEgypt
  3. 3.Department of Physics, Faculty of ScienceKing Khalid UniversityAbhaSaudi Arabia
  4. 4.Department of Physics, Faculty of SciencePort Said UniversityPort SaidEgypt
  5. 5.Department of Chemistry, Faculty of ScienceAl-Azhar UniversityAssiutEgypt
  6. 6.Department of Physics, Faculty of ScienceUniversity of JeddahJeddahSaudi Arabia
  7. 7.Department of Physics, Faculty of ScienceAssiut UniversityAssiutEgypt

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