Semiconductor Physics, Quantum Electronics & Optoelectronics, 28 (2), P. 215–220 (2025).
DOI: https://doi.org/10.15407/spqeo28.02.215
Ellipsometric study of Ag6+x(P1-xSix)S5I single crystals
A.I. Pogodin1, M.M. Pop1,2*, I.O. Shender1, M.J. Filep3, T.O. Malakhovska1, O.P. Kokhan1, K.V. Skubenych1, V. Izai4
1Uzhhorod National University, 46, Pidhirna str., 88000 Uzhhorod, Ukraine
2Institute for Information Recording, NAS of Ukraine, 88000 Uzhhorod Ukraine
3Ferenc Rákóczi II Transcarpathian Hungarian Institute, Kossuth Sq. 6, 90200 Beregovo, Ukraine
4Comenius University, Mlynska dolina, Bratislava 84248, Slovakia
*Corresponding author e-mail: mykhaylo.pop@uzhnu.edu.ua
Abstract. Single crystals of Ag6+x(P1-xSix)S5I (x = 0, 0.25, 0.5, 0.75, 1) solid solutions were grown by directional crystallization from the melt. Grown crystals were investigated using XRD and spectral ellipsometry. Ag6+x(P1-xSix)S5I crystals are characterized by formation of a continuous series of solid solutions with a cubic F-43m structure. The studied samples had a nonlinear spectral dependence of the refractive index n and the extinction coefficient k. The presence of a sharp maximum of n and a rather sharp decrease in the k spectral dependences are observed within the 570...730 nm range. The spectral dependence of the refractive index was described by the single-oscillator Wemple-DiDomenico (WD) model. Parameters of the Wemple-DiDomenico model for Ag6+x(P1-xSix)S5I single crystals were determined. The effect of heterovalent cationic Р+5 → Sі+4 substitution on parameters of the Wemple–DiDomenico model was discussed.
Keywords: argyrodite, single crystal, refractive index, band gap.
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