Composition-tuned optical absorption and luminescence of TlGaxIn1-xS2 layered mixed crystals at T=10 K

Transmittance on TlGaxIn1-xS2 mixed crystals (0 <= x <= 1) was carried out in the 2.35-2.75 eV photon energy range at T = 10 K. Band gap energies of crystals were obtained utilizing the derivative spectra of transmittance and photon energy dependence of absorption coefficient. The dependence of direct band gap energy on composition at T = 10 K revealed that as gallium composition is elevated in the mixed crystals, the direct band gap energy increases from 2.56 to 2.67 eV.


Spectroscopic ellipsometry investigation of optical properties of beta-Ga2S3 single crystals
Işık, Mehmet; Hasanlı, Nızamı; Gasanova, L. (Elsevier BV, 2018-12-01)
Ga2S3 single crystals were studied by x-ray diffraction (XRD), energy dispersive spectroscopy and spectroscopic ellipsometry measurements. XRD pattern of the sample is well-matched with reported hexagonal structure of beta-Ga2S3 . The spectra of real and imaginary parts of complex dielectric function (epsilon = epsilon(1) + epsilon(2)) and refractive index (N = n + ik) were plotted in the 1.2-6.2 eV range according to results of ellipsometric data. The e 2 -spectrum and analyses of absorption coefficient po...
Optical parameters of anisotropic chain-structured Tl2InGaTe4 crystals by spectroscopic ellipsometry
IŞIK, MEHMET; Hasanlı, Nızamı (Elsevier BV, 2016-01-01)
Spectroscopic ellipsometry measurements were performed on Tl2InGaTe4 single crystals in the 1.2-6.2 eV range for orientations of electric field, parallel (E//c) and perpendicular (E perpendicular to c) to optic axis c. Spectral dependence of optical parameters; real and imaginary components of the dielectric function, refractive index and extinction coefficient were obtained from the analyses of experimental data using an ambient-substrate optical model. The analysis of the absorption data calculated using ...
Optical properties of (Ga2Se3)(0.)(75) - (Ga2S3)(0.)(25) single crystals by spectroscopic ellipsometry
Işık, Mehmet; Hasanlı, Nızamı; Gasanova, L. (Elsevier BV, 2019-05-01)
Structural and optical properties of 75 mol % Ga2Se3 - 25 mol % Ga2S3 system of single crystals were investigated by experimental techniques of x-ray diffraction (XRD), energy dispersive spectroscopy, Raman spectroscopy and ellipsometry. XRD pattern indicated that the studied compound has crystalline nature with cubic structure. Vibrational modes in the crystal were revealed using Raman spectroscopy experiments in the 90-450 cm(-1) frequency range and nine modes were observed in the spectrum. Ellipsometry m...
Calculation of the Raman frequency shifts for the alpha phase of solid oxygen
Yurtseven, Hasan Hamit (Elsevier BV, 2017-01-01)
We calculate in this study the Raman frequencies of the two librons and one vibron at various pressures at constant temperatures of 10 K and also at the temperatures of 6 and 18 K by using the volume data from the literature through the mode Gruneisen parameter for the a phase of oxygen.
Optical properties of Tl2InGaS4 layered single crystal
Qasrawi, A. F.; Hasanlı, Nızamı (Elsevier BV, 2007-08-01)
The temperature dependence of the optical band gap of Tl2InGaS4 single crystal in the temperature region of 300-500 K and the room temperature refractive index, n(lambda), have been investigated. The absorption coefficient, which was calculated from the transmittance and reflectance spectra in the incident photon energy range of 2.28-2.48 eV, increased with increasing temperature. Consistently, the absorption edge shifts to lower energy values as temperature increases. The fundamental absorption edge corres...
Citation Formats
N. Hasanlı, “Composition-tuned optical absorption and luminescence of TlGaxIn1-xS2 layered mixed crystals at T=10 K,” OPTICAL MATERIALS, pp. 94–98, 2018, Accessed: 00, 2020. [Online]. Available: