Influence of order–disorder effects on the optical parameters of Ag7(Si1−xGex)S5I-mixed crystals.
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| Title: | Influence of order–disorder effects on the optical parameters of Ag |
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| Authors: | Pogodin, A. I.1 (AUTHOR) artempogodin88@gmail.com, Pop, M. M.1,2 (AUTHOR), Shender, I. A.1 (AUTHOR), Studenyak, I. P.1 (AUTHOR), Filep, M. J.1,3 (AUTHOR), Malakhovska, T. O.1 (AUTHOR), Kokhan, O. P.1 (AUTHOR), Babuka, T. Y.1 (AUTHOR), Suslikov, L. M.1 (AUTHOR), Rubish, V. M.2 (AUTHOR) |
| Source: | Journal of Materials Science: Materials in Electronics. Jun2022, Vol. 33 Issue 18, p15054-15066. 13p. |
| Subjects: | Mixed crystals, Electron-phonon interactions, Crystals, Temperature effect, Light absorption, Silicon alloys, Silver sulfide |
| Abstract: | The temperature behavior of fundamental absorption edge for Ag7(Si1−xGex)S5I (x = 0, 0.2, 0.4, 0.6, 0.8, 1) mixed crystals was studied in the temperature range 77–300 K. The temperature dependences of the optical pseudogap Eg* and the Urbach energy EU were analyzed in the framework of Einstein model. Monotonous non-linear decrease of Eg* and EU values in the process of Si+ 4→Ge+ 4 cationic substitution was established. The parameters of electron–phonon interaction σ, which results in the Urbach behavior of the fundamental absorption edge, were determined. The increase in temperature leads to the electron–phonon interaction weakening, which agrees well with the Dow–Redfield model. The monotonous Urbach energy increase and a similar optical pseudogap decrease indicate the absence of phase transitions within the studied temperature range. The temperature and structural disordering influence on the optical absorption in Ag7(Si1−xGex)S5I-mixed crystals were discussed. The Urbach energy in Ag7(Si1−xGex)S5I-mixed crystals is shown to be determined by the effect of the temperature related, structural, and compositional disordering. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | The temperature behavior of fundamental absorption edge for Ag7(Si1−xGex)S5I (x = 0, 0.2, 0.4, 0.6, 0.8, 1) mixed crystals was studied in the temperature range 77–300 K. The temperature dependences of the optical pseudogap Eg* and the Urbach energy EU were analyzed in the framework of Einstein model. Monotonous non-linear decrease of Eg* and EU values in the process of Si+ 4→Ge+ 4 cationic substitution was established. The parameters of electron–phonon interaction σ, which results in the Urbach behavior of the fundamental absorption edge, were determined. The increase in temperature leads to the electron–phonon interaction weakening, which agrees well with the Dow–Redfield model. The monotonous Urbach energy increase and a similar optical pseudogap decrease indicate the absence of phase transitions within the studied temperature range. The temperature and structural disordering influence on the optical absorption in Ag7(Si1−xGex)S5I-mixed crystals were discussed. The Urbach energy in Ag7(Si1−xGex)S5I-mixed crystals is shown to be determined by the effect of the temperature related, structural, and compositional disordering. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 09574522 |
| DOI: | 10.1007/s10854-022-08422-3 |
