Optical constants of Tl4Ga3InSe8 layered single crystals

Date

2007-11-15

Author

Goksen, K.
Hasanlı, Nızamı

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The optical properties of Tl(4)Ga(3)lnSe(8) layered single crystals have been studied by means of transmission and reflection measurements in the wavelength range of 500-1100 run. The analysis of the room temperature absorption data revealed the presence of both optical indirect and direct transitions with band gap energies of 1.94 and 2.20 eV, respectively. Transmission measurements carried out in the temperature range of 10-300 K revealed that the rate of change of the indirect band gap with temperature is gamma = -4.1 X 10(-4) eV/K. The absolute zero value of the band gap energy was obtained as E-gi(0) = 2.03 eV. The dispersion of the refractive index is discussed in terms of the Wemple-DiDomenico single-effective-oscillator model. The refractive index dispersion parameters: oscillator energy, dispersion energy, oscillator strength and zero-frequency refractive index were found to be 4. 10 eV, 23.17 eV, 6.21 X 10(13)m(-2) and 2.58, respectively. From X-ray powder diffraction study, the parameters of monoclinic unit cell were determined.

Subject Keywords

Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics

URI

https://hdl.handle.net/11511/39512

Journal

PHYSICA B-CONDENSED MATTER

DOI

https://doi.org/10.1016/j.physb.2007.07.020

Collections

Department of Physics, Article

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Citation Formats

K. Goksen and N. Hasanlı, “Optical constants of Tl4Ga3InSe8 layered single crystals,” PHYSICA B-CONDENSED MATTER, pp. 266–272, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/39512.