Influence of cation substitution on optical constants of (Cu₁₋ₓAgₓ)₇SiS₅I mixed crystals

• Published in: Semiconductor Physics Quantum Electronics & Optoelectronics
• Date: 2020
• Main Authors: Studenyak, I.P., Bereznyuk, S.M., Pop, M.M., Studenyak, V.I., Pogodin, A.I., Kokhan, O.P., Grančič, B., Kúš, P.
• Format: Article
• Language: English
• Published: Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України 2020
• Subjects: Optics
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/215711
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Influence of cation substitution on optical constants of (Cu₁₋ₓAgₓ)₇SiS₅I mixed crystals / I.P. Studenyak, S.M. Bereznyuk, M.M. Pop, V.I. Studenyak, A.I. Pogodin, O.P. Kokhan, B. Grančič, P. Kúš // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2020. — Т. 23, № 2. — С. 186-192. — Бібліогр.: 21 назв. — англ.

(Cu₁₋ₓAgₓ)₇SiS₅I mixed crystals were grown using the vertical zone crystallization method; they have been shown to crystallize in a cubic structure ( 4⎺3). The diffuse reflection spectra for the powders of (Cu₁₋ₓAgₓ)₇SiS₅I mixed crystals were measured at room temperature. Refractive indices and extinction coefficients for (Cu₁₋ₓAgₓ)₇SiS₅I mixed crystals were obtained from spectral ellipsometry measurements. A nonlinear decrease of the energy pseudogap and a nonlinear behavior with the maximum of refractive index have been revealed with increasing the Ag content. The dispersion of refractive indices of (Cu₁₋ₓAgₓ)₇SiS₅I has been described in the framework of different models.