Dimensionality-dependent electronic and vibrational dynamics in low-dimensional organic-inorganic tin halides
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2025
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866913842309627904 |
|---|---|
| author | He, Yanmei Cai, Xinyi Araujo, Rafael B. Wang, Yibo Ramesh, Sankaran Chen, Junsheng Zhang, Muyi Edvinsson, Tomas Gao, Feng Pullerits, Tonu |
| author_facet | He, Yanmei Cai, Xinyi Araujo, Rafael B. Wang, Yibo Ramesh, Sankaran Chen, Junsheng Zhang, Muyi Edvinsson, Tomas Gao, Feng Pullerits, Tonu |
| contents | Photo-induced dynamics of electronic processes in materials are driven by the coupling between electronic and nuclear degrees of freedom. Here we construct 1D and 2D organic-inorganic tin halides to investigate the functional role of dimensionality to exciton-phonon coupling (EPC) and exciton self-trapping. The results show that the 1D system has strong EPC leading to excitation-independent self-trapped exciton (STE) emission, while the 2D system exhibits over ten times weaker EPC resulting in free exciton emission. By performing femtosecond transient absorption experiments, we directly resolve the room-temperature vibrational wavepackets in the 1D system, some of which propagate along the STE potential energy surface. A combination of wagging and asymmetric stretching motions (~106 cm-1) in tin iodide is identified as such a mode inducing exciton self-trapping. While no room-temperature wavepackets are observed in the 2D system. These findings uncover the interplay between the dimensionality-dependent EPC and electronic/nuclear dynamics, offering constructive guidance to develop multifunctional organic-inorganic metal halides. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_11258 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dimensionality-dependent electronic and vibrational dynamics in low-dimensional organic-inorganic tin halides He, Yanmei Cai, Xinyi Araujo, Rafael B. Wang, Yibo Ramesh, Sankaran Chen, Junsheng Zhang, Muyi Edvinsson, Tomas Gao, Feng Pullerits, Tonu Chemical Physics Optics Photo-induced dynamics of electronic processes in materials are driven by the coupling between electronic and nuclear degrees of freedom. Here we construct 1D and 2D organic-inorganic tin halides to investigate the functional role of dimensionality to exciton-phonon coupling (EPC) and exciton self-trapping. The results show that the 1D system has strong EPC leading to excitation-independent self-trapped exciton (STE) emission, while the 2D system exhibits over ten times weaker EPC resulting in free exciton emission. By performing femtosecond transient absorption experiments, we directly resolve the room-temperature vibrational wavepackets in the 1D system, some of which propagate along the STE potential energy surface. A combination of wagging and asymmetric stretching motions (~106 cm-1) in tin iodide is identified as such a mode inducing exciton self-trapping. While no room-temperature wavepackets are observed in the 2D system. These findings uncover the interplay between the dimensionality-dependent EPC and electronic/nuclear dynamics, offering constructive guidance to develop multifunctional organic-inorganic metal halides. |
| title | Dimensionality-dependent electronic and vibrational dynamics in low-dimensional organic-inorganic tin halides |
| topic | Chemical Physics Optics |
| url | https://arxiv.org/abs/2505.11258 |