OPTICAL PROPERTIES OF THE SYSTEM TlInSe2(1-x)S2x (x= 0,4÷1,0) SOLID SOLUTIONS
1,2R.M. Sardarly, 1,3N.A. Aliyeva, 1G.E. Mammadova, 1A.A. Rasulova
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ABSTRACT

The dependence of the bandgap width on the concentration was investigated based on the reflection and emission spectra of solid solutions of the TlInSe2(1-x)S2x (x = 0.4; 0.6; 0.7; 0.8; 0.9; 1.0) system in the spectral range of 400–1100 nm at room temperature. The optical absorption spectra were analyzed, and the in-plane optical transition (Egd) and diagonal optical transition (Egi) energies of the TlInSe2(1-x)S2x (x= 0,4divide;1,0) solid solution systems were calculated: accordingly, with the change in composition, the in-plane optical transition changes in the range Egd=1.33-2.32 eV, and the diagonal optical transition changes in the range Egi=1.19-2.28 eV. It was also shown that the value of the emission coefficient also changes with the change in the composition of the studied solid solution. Based on the experimental results obtained, it was determined that the width of the band gap of crystals increases with the change in concentration in the TlInSe2(1-x)S2x (x = 0.4; 0.6; 0.7; 0.8; 0.9; 1.0) system.

Keywords: absorption spectra, straight and oblique transitions, forbidden zone, solid solution.
DOI:10.70784/azip.2.2025422

Received: 27.11.2025
Internet publishing: 02.12.2025    AJP Fizika A 2025 04 az p.22-25

AUTHORS & AFFILIATIONS

1. Ministry of Science and Education of the Republic of Azerbaijan, Institute of Radiation Problems, Baku, Azerbaijan
2. National Aviation Academy, Baku, Azerbaijan
3. Azerbaijan University of Architecture and Construction, Baku, Azerbaijan
E-mail: sardarli@yahoo.com

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