Determination of Optical Constants and Temperature Dependent Band Gap Energy of Gas<sub>0.25</Sub>se<sub>0.75< Single Crystals
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Date
2017
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Volume Title
Publisher
Natl inst Optoelectronics
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Abstract
Optical properties of GaS0.25Se0.75 single crystals were investigated by means of temperature -dependent transmission and room temperature reflection experiments. Derivative spectrophotometry analysis showed that indirect band gap energies of the crystal increase from 2.13 to 2.26 eV as temperature is decreased from 300 to 10 K. Temperature dependence of band gap energy was fitted under the light of theoretical expression. The band gap energy change with temperature and absolute zero value of the band gap energy were found from the analyses. The Wemple-DiDomenico single effective oscillator model and Sellmeier oscillator model were applied to the spectral dependence of room temperature refractive index to find optical parameters of the GaS0.25Se0.75 crystal. Chemical composition of the crystal was determined using the energy dispersive spectral measurements.
Description
Isik, Mehmet/0000-0003-2119-8266
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Keywords
Semiconductors, Band gap energy, Refractive index
Turkish CoHE Thesis Center URL
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Citation
WoS Q
Q4
Scopus Q
Q4
Source
Volume
19
Issue
5-6
Start Page
374
End Page
378