Chemical bond approach to optical properties of some flash evaporated Se 100 - XSb X chalcogenide alloys

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Amorphous thin films of Se100 XSbX (X = 1, 5, 10, 15 and 20) were synthesized by flash evaporation of the premelt quenched bulk samples. The optical properties were investigated from spectrophotometric measurements in the UV-VIS-NIR spectral region using Swanepoels standard envelope method and related techniques. The optical band gap energy (Eg opt) was evaluated from the Wemple-Didomenico (WDD) single oscillator model and Taucs extrapolation method in the region where the absorption coefficient, ω < 10 4 cm 1. The observed values of Eg opt and oscillator energy Eo were found to decrease monotonously with increasing Sb additive. The complex dielectric constant (ε), Urbach energy (Eu), optical conductivity (σ), plasma frequency (ωp) and lattice dielectric constant (εL) were deduced for each alloy composition. The complex refractive index (n) fitted well to Sellmeier function which can allow extrapolation of n outside the measured spectral range. The observed changes in optical parameters with Sb content were explained on the basis of increased defect states and changes in cohesive energy indicators (average heat of atomization (Hs), mean coordination number Z and average single bond energy.

Original languageEnglish
Article number10301
JournalEPJ Applied Physics
Volume59
Issue number1
DOIs
Publication statusPublished - Jul 1 2012

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Chemical bonds
chemical bonds
Extrapolation
flash
Permittivity
Optical properties
Optical conductivity
optical properties
Optical band gaps
Atomization
Amorphous films
extrapolation
Refractive index
Evaporation
oscillators
permittivity
Plasmas
Thin films
Defects
energy

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics

Cite this

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abstract = "Amorphous thin films of Se100 XSbX (X = 1, 5, 10, 15 and 20) were synthesized by flash evaporation of the premelt quenched bulk samples. The optical properties were investigated from spectrophotometric measurements in the UV-VIS-NIR spectral region using Swanepoels standard envelope method and related techniques. The optical band gap energy (Eg opt) was evaluated from the Wemple-Didomenico (WDD) single oscillator model and Taucs extrapolation method in the region where the absorption coefficient, ω < 10 4 cm 1. The observed values of Eg opt and oscillator energy Eo were found to decrease monotonously with increasing Sb additive. The complex dielectric constant (ε), Urbach energy (Eu), optical conductivity (σ), plasma frequency (ωp) and lattice dielectric constant (εL) were deduced for each alloy composition. The complex refractive index (n) fitted well to Sellmeier function which can allow extrapolation of n outside the measured spectral range. The observed changes in optical parameters with Sb content were explained on the basis of increased defect states and changes in cohesive energy indicators (average heat of atomization (Hs), mean coordination number Z and average single bond energy.",
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Chemical bond approach to optical properties of some flash evaporated Se 100 - XSb X chalcogenide alloys. / Muiva, C. M.; Sathiaraj, T. S.; Mwabora, J. M.

In: EPJ Applied Physics, Vol. 59, No. 1, 10301, 01.07.2012.

Research output: Contribution to journalArticle

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