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Applied Physics A

, Volume 36, Issue 1, pp 51–53 | Cite as

Optical properties of ternary ZnS x Se1−x polycrystalline thin films

  • A. A. El-Shazly
  • M. M. H. El-Naby
  • M. A. Kenawy
  • M. M. El-Nahass
  • H. T. El-Shair
  • A. M. Ebrahim
Contributed Papers

Abstract

Ternary ZnSxSe1−x polycrystalline thin films were prepared by evaporation in vacuum of 10−5 Torr. The molecular fractionx varied in the region o≦x≦1. The optical constants (the refractive indexn, the absorption indexk, and the absorption coefficientα) were determined in the wavelength range 300–1600nm. A plot representingα2=f(hv) shows that the ZnSxSe1−x polycrystalline thin films of different compositions have two direct transitions corresponding to the energy gapsE andE+Δ. The variation in eitherE orE+Δ withx indicates that this system belongs to the amalgamation type. Such variation follows a quadratic equation. The bowing parameter was found to be 0.456 eV, roughly equal to the calculated value 0.60 eV using the empirical pseudopotential method based on the virtual-crystal approximation, in which the disorder effect has not been taken into account.

PACS

78.50 

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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • A. A. El-Shazly
    • 1
  • M. M. H. El-Naby
    • 1
    • 2
  • M. A. Kenawy
    • 1
    • 2
  • M. M. El-Nahass
    • 1
  • H. T. El-Shair
    • 1
  • A. M. Ebrahim
    • 1
  1. 1.Faculty of EducationAin Shams UniversityCairoEgypt
  2. 2.Univ. College for Women's, Ain Shams UniversityCairoEgypt

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