Temperature-dependent optical properties of GaSe layered single crystals

Date

2016-8-01

Author

Hasanlı, Nızamı

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Optical properties of GaSe single crystals have been investigated using temperature-dependent transmission and room temperature reflection measurements in the wavelength range of 380–1100 nm. The analysis of the absorption data at room temperature showed the existence of indirect transitions in the crystal with energy band gap of 1.98 eV. Temperature dependence of the transmission measurements revealed the shift of the absorption edge toward lower energy as temperature is increased from 10 to 280 K. The rate of change of the indirect band gap was found as γ = −6.6 × 10−4 eV/K from the analysis of experimental data under the light of theoretical relation giving the band gap energy as a function of temperature. The absolute zero value of the band gap energy and Debye temperature were calculated from the same analysis. The Wemple–DiDomenico single-effective-oscillator model applied to refractive index dispersion data was used to determine the oscillator energy, dispersion energy, oscillator strength and zero-frequency refractive index values.

Subject Keywords

Semiconductors, Optical properties, Crystals

URI

https://hdl.handle.net/11511/76021

Journal

Philosophical Magazine

DOI

https://doi.org/10.1080/14786435.2016.1209593

Collections

Department of Physics, Article

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Temperature-dependent optical properties of GaSe layered single crystals IŞIK, MEHMET; TUĞAY, EVRİN; Gasanly, N. M. (2016-01-01) Optical properties of GaSe single crystals have been investigated using temperature-dependent transmission and room temperature reflection measurements in the wavelength range of 380-1100nm. The analysis of the absorption data at room temperature showed the existence of indirect transitions in the crystal with energy band gap of 1.98eV. Temperature dependence of the transmission measurements revealed the shift of the absorption edge toward lower energy as temperature is increased from 10 to 280K. The rate o...
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Optical properties of TlGaxIn1-xS2 layered mixed crystals (0 <= x <= 1) I. Composition- and temperature-tuned energy band gap Hasanlı, Nızamı (2010-05-28) Optical properties of the TlGaxIn1-xS2 mixed crystals (0 <= x <= 1) have been studied by means of transmission and reflection measurements in the wavelength range of 400-1100 nm. The optical indirect band gap energies were determined through the analysis of the absorption data. It was found that the energy band gaps increase with increasing of gallium atoms content in the TlGaxIn1-xS2 mixed crystals. From the transmission measurements carried out in the temperature range of 10-300K, the rates of change of t...
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Determination of optical parameters of Ga0.75In0.25Se layered crystals IŞIK, MEHMET; Hasanlı, Nızamı (2012-05-01) The optical properties of the Ga0.75In0.25Se crystals have been investigated by means of transmission and reflection measurements in the wavelength range of 380-1100 nm. The analysis of the results performed at room temperature revealed the presence of optical indirect transtions with band gap energy of 1.89 eV. The variation of the band gap energy as a function of temperature was also studied in the temperature range of 10-300 K. The rate of change of band gap energy (? = 6.2 x 10(4) eV/K) and absolute zer...

Citation Formats

N. Hasanlı, “Temperature-dependent optical properties of GaSe layered single crystals,” Philosophical Magazine, pp. 2564–2573, 2016, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/76021.