Optical properties of amorphous Se90-XIn10SbXthin film alloys

Cosmas M. Muiva, Julius M. Mwabora, T. S. Sathiaraj, James G. King

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Ternary thin film alloys of Se90-XIn10SbX(x = 1, 4, 10, 15 and 20) were synthesised by flash evaporation of the pre-melt quenched bulk samples under a vacuum of 10−5 Torr. Optical absorption analysis pointed to indirect allowed transitions as the mechanism of excitation across the energy gap. The optical band gap (Eg) was evaluated on the basis of Wemple-Didomenico single oscillator model and Tauc's extrapolation method in the spectral region where the absorption coefficient, α ≥ 104 cm−1. The refractive index (n), complex dielectric constant (ε), band tailing parameter (B), plasma frequency (ωp), single oscillator parameters (Eoand Ed) and lattice dielectric constant (εL) were deduced for each alloy. The compositional dependence of optical and dielectric parameters was explained on the basis of chemical bond approach. The observed shift in the trends of Eg, Ed, εLand ωpvalues at the composition where Sb = 4 at% was correlated to the usual chemical threshold at this composition.

Original languageEnglish
Pages (from-to)432-438
Number of pages7
JournalJournal of Alloys and Compounds
Volume689
DOIs
Publication statusPublished - Jan 1 2016

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Permittivity
Optical properties
Chemical bonds
Optical band gaps
Tailings
Electron transitions
Chemical analysis
Extrapolation
Light absorption
Refractive index
Evaporation
Energy gap
Vacuum
Plasmas
Thin films

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

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abstract = "Ternary thin film alloys of Se90-XIn10SbX(x = 1, 4, 10, 15 and 20) were synthesised by flash evaporation of the pre-melt quenched bulk samples under a vacuum of 10−5 Torr. Optical absorption analysis pointed to indirect allowed transitions as the mechanism of excitation across the energy gap. The optical band gap (Eg) was evaluated on the basis of Wemple-Didomenico single oscillator model and Tauc's extrapolation method in the spectral region where the absorption coefficient, α ≥ 104 cm−1. The refractive index (n), complex dielectric constant (ε), band tailing parameter (B), plasma frequency (ωp), single oscillator parameters (Eoand Ed) and lattice dielectric constant (εL) were deduced for each alloy. The compositional dependence of optical and dielectric parameters was explained on the basis of chemical bond approach. The observed shift in the trends of Eg, Ed, εLand ωpvalues at the composition where Sb = 4 at{\%} was correlated to the usual chemical threshold at this composition.",
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Optical properties of amorphous Se90-XIn10SbXthin film alloys. / Muiva, Cosmas M.; Mwabora, Julius M.; Sathiaraj, T. S.; King, James G.

In: Journal of Alloys and Compounds, Vol. 689, 01.01.2016, p. 432-438.

Research output: Contribution to journalArticle

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