Salvato in:
| Autori principali: | , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2504.10292 |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866911170499182592 |
|---|---|
| author | Soares, C. C. S. Rodríguez-Hernández, J. S. Silva, Bruno P. Gómez, Mayra A. P. Neto, V. S. Ayala, A. P. Paschoal, C. W. A. |
| author_facet | Soares, C. C. S. Rodríguez-Hernández, J. S. Silva, Bruno P. Gómez, Mayra A. P. Neto, V. S. Ayala, A. P. Paschoal, C. W. A. |
| contents | Due to their well-suited optoelectronic properties, metal halide perovskites are emerging semiconductor materials with potential applications in solar cells, detectors, and light-emitting diodes. Beyond the traditional 3D perovskites, low-dimensional counterparts have more attractive effects such as excitonic emissions and quantum confinements that are enhanced by the reduced dimensionality, which involve the Electron-Phonon Coupling (EPC). Such phenomenon, which comprehends the interaction between charge carriers and lattice vibrations, usually strongly impacts the photoluminescence (PL) response in low-dimensional frameworks. In this paper, we investigated the intrinsic EPC onto low-temperature PL of the zero-dimensional (0D) Rb2SnBr6 perovskite. Temperature-dependent PL measurements, complemented by various characterization techniques and theoretical calculations, revealed broadband emission with a significant Stokes shift attributed to self-trapped excitons (STEs). The Fröhlich mechanism, mediated by interactions between excitonic charge carriers and longitudinal optical (LO) phonons, primarily accounts for the emission broadening through phonon-assisted radiative recombination. The EPC strength was evaluated through the Huang-Rhys factor S=34, confirming strong correlations between electronic and vibrational properties and supporting the STE emission assumption. The possible mechanism of STE formation was evaluated by the Fröhlich parameter α of 1.94 for electrons and 4.73 for holes, which points out a major contribution of the hole-polaron quasi-particle on exciton trapping. Our findings give insights regarding the influence of EPC in 0D perovskites and STE formation, which leads to the assessment of Rb2SnBr6 for light-harvesting applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_10292 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Electron-Phonon Coupling Mediated by Fröhlich Interaction in Rb2SnBr6 Perovskite Soares, C. C. S. Rodríguez-Hernández, J. S. Silva, Bruno P. Gómez, Mayra A. P. Neto, V. S. Ayala, A. P. Paschoal, C. W. A. Materials Science Due to their well-suited optoelectronic properties, metal halide perovskites are emerging semiconductor materials with potential applications in solar cells, detectors, and light-emitting diodes. Beyond the traditional 3D perovskites, low-dimensional counterparts have more attractive effects such as excitonic emissions and quantum confinements that are enhanced by the reduced dimensionality, which involve the Electron-Phonon Coupling (EPC). Such phenomenon, which comprehends the interaction between charge carriers and lattice vibrations, usually strongly impacts the photoluminescence (PL) response in low-dimensional frameworks. In this paper, we investigated the intrinsic EPC onto low-temperature PL of the zero-dimensional (0D) Rb2SnBr6 perovskite. Temperature-dependent PL measurements, complemented by various characterization techniques and theoretical calculations, revealed broadband emission with a significant Stokes shift attributed to self-trapped excitons (STEs). The Fröhlich mechanism, mediated by interactions between excitonic charge carriers and longitudinal optical (LO) phonons, primarily accounts for the emission broadening through phonon-assisted radiative recombination. The EPC strength was evaluated through the Huang-Rhys factor S=34, confirming strong correlations between electronic and vibrational properties and supporting the STE emission assumption. The possible mechanism of STE formation was evaluated by the Fröhlich parameter α of 1.94 for electrons and 4.73 for holes, which points out a major contribution of the hole-polaron quasi-particle on exciton trapping. Our findings give insights regarding the influence of EPC in 0D perovskites and STE formation, which leads to the assessment of Rb2SnBr6 for light-harvesting applications. |
| title | Electron-Phonon Coupling Mediated by Fröhlich Interaction in Rb2SnBr6 Perovskite |
| topic | Materials Science |
| url | https://arxiv.org/abs/2504.10292 |