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Dimensionality-dependent electronic and vibrational dynamics in low-dimensional organic-inorganic tin halides

He, Yanmei LU ; Cai, Xinyi ; Araujo, Rafael B. ; Wang, Yibo LU ; Ramesh, Sankaran LU orcid ; Chen, Junsheng LU ; Zhang, Muyi ; Edvinsson, Tomas ; Gao, Feng and Pullerits, Tönu LU (2026) In Nature Communications 17.
Abstract

Photo-induced dynamics of electronic processes are driven by the coupling between electronic and nuclear degrees of freedom. Here, we construct one- and two-dimensional organic-inorganic tin halides to investigate how dimensionality controls exciton-phonon coupling and exciton self-trapping. The results show that a one-dimensional system has strong exciton-phonon coupling leading to excitation-independent self-trapped exciton emission, whereas a two-dimensional system exhibits over ten times weaker coupling resulting in free exciton emission. The difference originates from enhanced Anderson localization in a one-dimensional system. Femtosecond transient absorption experiments directly resolve room-temperature vibrational wavepackets in... (More)

Photo-induced dynamics of electronic processes are driven by the coupling between electronic and nuclear degrees of freedom. Here, we construct one- and two-dimensional organic-inorganic tin halides to investigate how dimensionality controls exciton-phonon coupling and exciton self-trapping. The results show that a one-dimensional system has strong exciton-phonon coupling leading to excitation-independent self-trapped exciton emission, whereas a two-dimensional system exhibits over ten times weaker coupling resulting in free exciton emission. The difference originates from enhanced Anderson localization in a one-dimensional system. Femtosecond transient absorption experiments directly resolve room-temperature vibrational wavepackets in a one-dimensional system, some of which propagate along the self-trapped-exciton 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 a two-dimensional system. These findings uncover the interplay between dimensionality-dependent exciton-phonon coupling and electronic/nuclear dynamics, offering constructive guidance to develop multifunctional organic-inorganic metal halides.

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author
; ; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nature Communications
volume
17
article number
758
pages
10 pages
publisher
Nature Publishing Group
external identifiers
  • scopus:105028107707
  • pmid:41540135
ISSN
2041-1723
DOI
10.1038/s41467-026-68544-8
language
English
LU publication?
yes
additional info
© 2026. The Author(s).
id
67612e2c-1728-417c-bafb-b1331fb40d13
date added to LUP
2026-01-31 18:05:49
date last changed
2026-02-02 13:31:21
@article{67612e2c-1728-417c-bafb-b1331fb40d13,
  abstract     = {{<p>Photo-induced dynamics of electronic processes are driven by the coupling between electronic and nuclear degrees of freedom. Here, we construct one- and two-dimensional organic-inorganic tin halides to investigate how dimensionality controls exciton-phonon coupling and exciton self-trapping. The results show that a one-dimensional system has strong exciton-phonon coupling leading to excitation-independent self-trapped exciton emission, whereas a two-dimensional system exhibits over ten times weaker coupling resulting in free exciton emission. The difference originates from enhanced Anderson localization in a one-dimensional system. Femtosecond transient absorption experiments directly resolve room-temperature vibrational wavepackets in a one-dimensional system, some of which propagate along the self-trapped-exciton potential energy surface. A combination of wagging and asymmetric stretching motions (~106 cm<sup>-1</sup>) in tin iodide is identified as such a mode, inducing exciton self-trapping. While no room-temperature wavepackets are observed in a two-dimensional system. These findings uncover the interplay between dimensionality-dependent exciton-phonon coupling and electronic/nuclear dynamics, offering constructive guidance to develop multifunctional organic-inorganic metal halides.</p>}},
  author       = {{He, Yanmei and Cai, Xinyi and Araujo, Rafael B. and Wang, Yibo and Ramesh, Sankaran and Chen, Junsheng and Zhang, Muyi and Edvinsson, Tomas and Gao, Feng and Pullerits, Tönu}},
  issn         = {{2041-1723}},
  language     = {{eng}},
  month        = {{01}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Nature Communications}},
  title        = {{Dimensionality-dependent electronic and vibrational dynamics in low-dimensional organic-inorganic tin halides}},
  url          = {{http://dx.doi.org/10.1038/s41467-026-68544-8}},
  doi          = {{10.1038/s41467-026-68544-8}},
  volume       = {{17}},
  year         = {{2026}},
}