Optical properties of Tl2In2Se3S layered single crystals

Date

2010-01-01

Author

Güler, Işıkhan
Hasanlı, Nızamı

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The optical properties of Tl2In2Se3S layered single crystals have been analyzed using transmission and reflection measurements in the wavelength region between 500 and 1100 nm. The optical indirect transitions with a band gap energy of 1.96 eV and direct transitions with a band gap energy of 2.16 eV were determined from analysis of absorption data at room temperature. 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 4.67 eV, 45.35 eV, 1.38 x 1014 m-2 and 3.27, respectively. Transmission measurements were also performed in the temperature range 10-300 K. As a result of temperature-dependent transmission measurements, the rate of change in the indirect band gap with temperature, i.e. = -5.6 x 10-4 eV/K, and the absolute zero value of the band gap energy, Egi(0) = 2.09 eV, were obtained.

Subject Keywords

Optical properties, Refractive index, Semiconductors, Energy band gap

URI

https://hdl.handle.net/11511/30622

Journal

PHILOSOPHICAL MAGAZINE

DOI

https://doi.org/10.1080/14786430903489615

Collections

Graduate School of Natural and Applied Sciences, Article

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Citation Formats

I. Güler and N. Hasanlı, “Optical properties of Tl2In2Se3S layered single crystals,” PHILOSOPHICAL MAGAZINE, pp. 1799–1806, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30622.