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Journal of Materials Chemistry C

Strong Electron-Phonon Coupling in Vacancy-Ordered Cs2SnBr6 Double Perovskite

Cássio C.S. Soares,   Juan Simon Rodriguez Hernandez,   Mayra Alexandra AP Padrón Gómez,   Davino Machado Andrade Neto,   Pierre Fechine,   Alejandro Pedro Ayala  and  William de Araujo Paschoal  

Abstract

Vacancy-ordered double perovskites (VODPs), such as Cs2SnBr6, are emerging as eco-friendly and stable alternatives to lead halide perovskites (LHPs). Recently, Cs2SnBr6 functionalities have been explored for application in light-emitting diodes. In this paper, we systematically studied the temperature-dependent optical properties of Cs2SnBr6 VODP. Our analysis reveals a strong electron-phonon (EP) coupling at room temperature, as evidenced by multiphonon scattering, leading to intense overtones up to the fourth order. Such strength of the EP coupling was confirmed by a Huang-Rhys factor S = 24.4. Additionally, we observe that EP interaction induces the formation of Self-Trapped Excitons (STE), which are the main source of its photoluminescence. Our results offer insights into EP influences on multiphonon scattering and STE emergence, guiding the design of Cs2SnBr6-based materials for light-harvesting applications.

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Article information

DOI
https://doi.org/10.1039/D4TC01818D
Article type
Paper
Submitted
03 May 2024
Accepted
28 Aug 2024
First published
30 Aug 2024

J. Mater. Chem. C, 2024, Accepted Manuscript

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Strong Electron-Phonon Coupling in Vacancy-Ordered Cs2SnBr6 Double Perovskite

C. C.S. Soares, J. S. R. Hernandez, M. A. A. Padrón Gómez, D. Machado Andrade Neto, P. Fechine, A. P. Ayala and W. D. A. Paschoal, J. Mater. Chem. C, 2024, Accepted Manuscript , DOI: 10.1039/D4TC01818D

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