Optical absorption and reflection studies of Tl4InGa3S8 layered single crystals

Date

2007-07-01

Author

Goksen, K.
Hasanlı, Nızamı
Ozkan, H.

Metadata

Show full item record

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

Item Usage Stats

244
views

0
downloads

The optical properties of Tl4InGa3S8 layered single crystals have been studied by means of transmission and reflection measurements in the wavelength region between 400 and 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 2.40 and 2.61 eV, respectively. Transmission measurements carried out in the temperature range of 10-300 K revealed the rate of change of the indirect band gap with temperature as gamma = -6.0 x 10(-4) eV/K. The absolute zero value of the band gap energy was obtained as E-gi(0) = 2.52 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 5.07 eV, 26.67 eV, 8.82 x 10(13) m(-2), and 2.50, respectively.

Subject Keywords

General Physics and Astronomy

URI

https://hdl.handle.net/11511/48600

Journal

ACTA PHYSICA POLONICA A

DOI

https://doi.org/10.12693/aphyspola.112.93

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Excitation intensity- and temperature-dependent photoluminescence in layered structured Tl2GaInSe2S2 crystals Hasanlı, Nızamı (AIP Publishing, 2013-02-21) Photoluminescence spectra of Tl2GaInSe2S2 layered crystals have been registered in the temperature range of 17-62 K and in the wavelength region of 525-690 nm. A broad visible photoluminescence band centered at 590 nm (2.10 eV) was observed at T 17 K. Variation of emission band has been studied as a function of laser excitation intensity in the 0.1-55.7 mW cm(-2) range. The analysis of the spectra reveals that the peak energy position changes with excitation intensity (blue shift). The radiative transitions...
Optical properties of TlGa(SxSe1-x) 2 layered mixed crystals (0=x=1): Absorption edge and photoluminescence study at T=10 K Hasanlı, Nızamı (Springer Science and Business Media LLC, 2018-09-01) Transmittance measurements of layered mixed crystals were performed in the 1.80-2.80 eV photon energy range at . Band-gap energies of the studied crystals were estimated by means of the derivative spectra of transmittance and photon energy dependence of absorption coefficient. The compositional dependence of direct band-gap energy at revealed that as sulphur (selenium) composition is increased (decreased) in the mixed crystals, the direct band-gap energy increases from 2.19 eV () to 2.67 eV (). Photolumines...
Tuning Optical Absorption Edge by Composition and Temperature in TlGaS2xSe2((1-x)) Layered Mixed Crystals (0 <= x <= 1) Hasanlı, Nızamı (Institute of Physics, Polish Academy of Sciences, 2012-10-01) Optical properties of TlGaS2xSe2((1-x)) mixed crystals (0 <= x <= 1) have been studied using the 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 increase of sulfur atoms content in TlGaS2xSe2(1-x) mixed crystals. From the transmission measurements carried out in the temperature range of 10-300 K, the rates of change of the i...
Spectroscopic study and numerical simulation of low-pressure radio-frequency capacitive discharge with argon downstream Tanisli, Murat; Rafatov, İsmail; Sahin, Neslihan; Mertadam, Sercan; Demir, Suleyman (Canadian Science Publishing, 2017-02-01) In this study, the characteristic properties and plasma parameters of capacitive radio frequency (RF) argon (Ar) discharge and supplementary discharge at low pressure are investigated with optical emission spectroscopy (OES). The wavelengths of spectral lines from OES are obtained between 650-900 nm. Using OES lines and related experimental data, the electron temperatures for different RF power, flow, and measurement periods are determined. Eventually, the properties of plasma including the electron tempera...
Antiproton Flux, Antiproton-to-Proton Flux Ratio, and Properties of Elementary Particle Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station Aguilar, M.; et. al. (American Physical Society (APS), 2016-08-26) A precision measurement by AMS of the antiproton flux and the antiproton-to-proton flux ratio in primary cosmic rays in the absolute rigidity range from 1 to 450 GV is presented based on 3.49 x 10(5) antiproton events and 2.42 x 10(9) proton events. The fluxes and flux ratios of charged elementary particles in cosmic rays are also presented. In the absolute rigidity range similar to 60 to similar to 500 GV, the antiproton (p) over bar, proton p, and positron e(+) fluxes are found to have nearly identical ri...

Citation Formats

K. Goksen, N. Hasanlı, and H. Ozkan, “Optical absorption and reflection studies of Tl4InGa3S8 layered single crystals,” ACTA PHYSICA POLONICA A, pp. 93–100, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48600.