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

Date

2015-07-21

Author

Hasanlı, Nızamı

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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

Collections

Department of Physics, Article