Strong electron–phonon coupling in vacancy-ordered Cs2SnBr6 double perovskite

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 temperatu...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2024-10, Vol.12 (41), p.16758-16765
Main Authors: Soares, C C S, Rodríguez-Hernández, J S, Gómez, Mayra A P, Andrade, Davino M, Fechine, Pierre B A, Ayala, A P, Paschoal, C W A
Format: Article
Language:English
Subjects:
Coupling
Excitons
Lead compounds
Light emitting diodes
Metal halides
Optical properties
Perovskites
Phonons
Photoluminescence
Room temperature
Scattering
Temperature dependence
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Summary: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 the 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 the EP interaction induces the formation of self-trapped excitons (STEs), which are the main source of its photoluminescence. Our results offer insights into influences of EP coupling on multiphonon scattering and STE emergence, guiding the design of Cs2SnBr6-based materials for light-harvesting applications.
ISSN:2050-7526
2050-7534
DOI:10.1039/d4tc01818d