Composition dependence of lattice parameters and band gap energies of thallium based layered mixed crystals

Date

2015-07-01

Author

Hasanlı, Nızamı

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Compositional dependence of lattice parameters and unit cell volumes of TlMeX2-type (Me = Ga or In and X = S or Se) layered mixed crystals with monoclinic structure has been studied by X-ray diffraction technique. It is revealed that the lattice parameters of TlGa1-xInxSe2, TlGa(S1-xSex)(2), TlGa1-xInxS2 and TlIn(Se1-xSx)(2) mixed crystals increase due to the substitution of gallium atoms by indium and sulfur atoms by selenium. Moreover, the absorption edges of these mixed crystals have been investigated through the transmission and reflection measurements in the wavelength range of 400-1,100 nm. The analysis of absorption data has revealed the presence of both optical indirect and direct transitions. It is found that the energy band gaps of mixed crystals decrease due to the substitution of gallium atoms by indium and of sulfur atoms by selenium.

Subject Keywords

Optical band gap, Semiconductors, Layered crystals, X-ray diffraction

URI

https://hdl.handle.net/11511/41302

Journal

INDIAN JOURNAL OF PHYSICS

DOI

https://doi.org/10.1007/s12648-014-0636-x

Collections

Department of Physics, Article

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Composition dependency of lattice anisotropy of TlBX2-type chain mixed crystals Hasanlı, Nızamı; Tas, M (Wiley, 2000-01-01) Variation of the lattice parameters of TlTl1-xInxSe2 chain mixed crystals with composition have been studied by X-ray diffraction technique. The lattice anisotropy (c/a) of the TlBX2-type mixed crystals changes linearly with substitution of the atoms located bath at the center and at the vertices of the BX4 tetrahedra. A brief survey of the important features of the effect of isomorphic atom substitution on the lattice anisotropy of TlBX2-type mixed crystals with chain structure has been presented.
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...

Citation Formats

N. Hasanlı, “Composition dependence of lattice parameters and band gap energies of thallium based layered mixed crystals,” INDIAN JOURNAL OF PHYSICS, pp. 657–661, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41302.