Band gap and refractive index tunability in thallium based layered mixed crystals

Download

index.pdf

Date

2015-07-21

Author

Hasanlı, Nızamı

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

23
views

0
downloads

Compositional variation of the band gap energy and refractive index of TlMeX2-type (Me = Ga or In and X = S or Se) layered mixed crystals have been studied by the transmission and reflection measurements in the wavelength range of 400-1100 nm. The analysis of absorption data of TlGa1-xInxSe2, TlGa(S1-xSex)(2), TlGa1-xInxS2, and TlIn(Se1-xSx)(2) mixed crystals revealed the presence of both optical indirect and direct transitions. It was found that the energy band gaps of mixed crystals decrease at the replacing of gallium atoms by indium and of sulfur atoms by selenium ones. Through the similar replacing of atoms (smaller atoms by larger ones) in the studied mixed crystals, the refractive index shows the quite opposite behavior. (C) 2015 AIP Publishing LLC.

Subject Keywords

Ellipsometry, Tlgase2, Optical-absorption, Lattice-parameters, Electrical-properties, Dielectric-properties, Interband-transitions, Tlins2 single-crystals, Isomorphic atom substitution, Equal-to 1

URI

https://hdl.handle.net/11511/42093

Journal

JOURNAL OF APPLIED PHYSICS

DOI

https://doi.org/10.1063/1.4926864

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

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...
Specific features of the optical spectra in Tl2In2S3Se layered single crystals Hasanlı, Nızamı; Güler, Işıkhan (2007-06-01) The optical properties of Tl2In2S3Se layered single crystals have been studied by means of transmission and reflection measurements in the wavelength range of 450-1100 nm. The analysis of the absorption data revealed the presence of both optical indirect and direct transitions with energy band gaps of 2.16 and 2.42 eV, respectively. The observed coexistence of indirect and direct energy band gaps is related to the anisotropy of the TI-containing layered crystals. The dispersion of the refractive index is di...
Refractive index and oscillator parameters in TlGaS2, TlGaSe2 and TlInS2 layered crystals Hasanlı, Nızamı (2011-01-01) The optical properties of TlGaS2, TlGaSe2, and TlInS2 crystals have been investigated through the transmission and reflection measurements at room temperature in the wavelength range of 400-1100 nm. These measurements allowed determination of spectral dependence of the refractive index for all crystals studied. The dispersion of the refractive index is discussed in terms of the Wemple-DiDomenico single-effective-oscillator model. The refractive index dispersion parameters: the oscillator energies, the dispe...
Compositional dependence of refractive index and oscillator parameters in T1GaS(2x)Se(2(1-x)) layered mixed crystals (0 <= x <= 1) Hasanlı, Nızamı (2012-09-14) Optical characterization of TIGaS2xSe2(1-x) mixed crystals have been carried out at room temperature using the transmission and reflection measurements in the wavelength range of 400-1100 nm. The spectral dependence of the refractive index for all compositions of studied crystals were obtained. The dispersion of the refractive index is discussed in terms of the Wemple-DiDomenico single-effective-oscillator model. The compositional dependencies of refractive index dispersion parameters: oscillator energy, di...
Dispersive optical constants and temperature tuned band gap energy of Tl2InGaS4 layered crystals Goksen, K.; Hasanlı, Nızamı; Ozkan, H. (IOP Publishing, 2007-06-27) The optical properties of Tl2InGaS4 layered single crystals have been studied by means of transmission and reflection measurements in the wavelength range of 400-1100 nm. The analysis of the room temperature absorption data revealed the presence of both optical indirect and direct transitions with band gap energies of 2.35 and 2.54 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 =...

Citation Formats

N. Hasanlı, “Band gap and refractive index tunability in thallium based layered mixed crystals,” JOURNAL OF APPLIED PHYSICS, pp. 0–0, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42093.