Abstract
TlInSSe [(TlInS2)0.5(TlInSe2)0.5] crystals have garnered significant attention as promising candidates for optoelectronic applications due to their exceptional optoelectrical characteristics. This study focused on investigating the linear and nonlinear optical properties of TlInSSe layered single crystals through ellipsometry measurements. The X-ray diffraction analysis revealed the presence of four distinct peaks corresponding to a monoclinic crystalline structure. In-depth analysis was conducted to examine the variations of refractive index, extinction coefficient, and complex dielectric function within the energy range of 1.25–6.15 eV. By employing derivative analysis of the absorption coefficient and utilizing the Tauc relation, the indirect and direct bandgap energies of TlInSSe crystals were determined to be 2.09 and 2.26 eV, respectively. Furthermore, this research paper presents findings on oscillator energy, dispersion energy, Urbach energy, zero and high frequency dielectric constants, plasma frequency, carrier density to effective mass ratio, nonlinear refractive index, and first-order and third-order nonlinear susceptibilities of TlInSSe crystals.
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The data that support the findings of this study are available from the corresponding authors upon reasonable request.
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Acknowledgements
We thank GUNAM Laboratory at the Middle East Technical University for the use of their equipment which are X-ray diffraction and ellipsometry measurements.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by IG, MI and NG. The first draft of the manuscript was written by IG and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Guler, I., Isik, M. & Gasanly, N. Optical characterization of (TlInS2)0.5(TlInSe2)0.5 crystal by ellipsometry: linear and optical constants for optoelectronic devices. J Mater Sci: Mater Electron 34, 1346 (2023). https://doi.org/10.1007/s10854-023-10755-6
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DOI: https://doi.org/10.1007/s10854-023-10755-6