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Thermal effects on the dynamics of excitons in CsPb(Br1−xClx)3

Pereira-Andrade, E. ; Machado, M. V.H. ; Lamers, Nils LU ; Huang, Ziyun LU ; Wallentin, Jesper LU ; Malachias, A. ; Cury, L. A. ; Marçal, L. A.B. LU and Sáfar, G. A.M. (2025) In Solid State Sciences 168.
Abstract

The long-standing debate in the scientific community about whether ferroelectricity or ferroelasticity is the key property influencing the optoelectronic behavior of metal halide perovskites continues. In this study, we experimentally investigate the temperature dependence of photoluminescence from CsPb(Br1−xClx)3 nanowires and their heterojunctions. Our findings show an enhancement of the exciton lifetime in the CsPb(Br1−xClx)3 nanowires, which we attribute to crystallographic phase transitions, independent of halide composition explored in this study and its effect on transition temperatures. Understanding the phenomenon could help to improve perovskite-based... (More)

The long-standing debate in the scientific community about whether ferroelectricity or ferroelasticity is the key property influencing the optoelectronic behavior of metal halide perovskites continues. In this study, we experimentally investigate the temperature dependence of photoluminescence from CsPb(Br1−xClx)3 nanowires and their heterojunctions. Our findings show an enhancement of the exciton lifetime in the CsPb(Br1−xClx)3 nanowires, which we attribute to crystallographic phase transitions, independent of halide composition explored in this study and its effect on transition temperatures. Understanding the phenomenon could help to improve perovskite-based photovoltaic devices, especially when these devices operate at temperatures slightly above room temperature. We propose a mechanism that models the nanowires as disordered strain superlattices, suggesting that flexoelectric spatial modulation plays a significant role in defining their light emission properties. These insights could, in principle, be extended to explain similar phenomena in the systems of many other metal halide perovskites. Our research provides valuable understanding into how phase transitions can be leveraged to extend exciton lifetimes and optimize charge carrier dynamics, potentially leading to advancements in the efficiency of solar cells and light-emitting devices.

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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Solid State Sciences
volume
168
article number
108043
publisher
Elsevier
external identifiers
  • scopus:105012576203
ISSN
1293-2558
DOI
10.1016/j.solidstatesciences.2025.108043
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2025 Elsevier Masson SAS
id
b4d0a980-1f0b-428d-8dd2-79ede2b1385b
date added to LUP
2025-08-18 11:27:10
date last changed
2025-08-19 08:38:27
@article{b4d0a980-1f0b-428d-8dd2-79ede2b1385b,
  abstract     = {{<p>The long-standing debate in the scientific community about whether ferroelectricity or ferroelasticity is the key property influencing the optoelectronic behavior of metal halide perovskites continues. In this study, we experimentally investigate the temperature dependence of photoluminescence from CsPb(Br<sub>1−x</sub>Cl<sub>x</sub>)<sub>3</sub> nanowires and their heterojunctions. Our findings show an enhancement of the exciton lifetime in the CsPb(Br<sub>1−x</sub>Cl<sub>x</sub>)<sub>3</sub> nanowires, which we attribute to crystallographic phase transitions, independent of halide composition explored in this study and its effect on transition temperatures. Understanding the phenomenon could help to improve perovskite-based photovoltaic devices, especially when these devices operate at temperatures slightly above room temperature. We propose a mechanism that models the nanowires as disordered strain superlattices, suggesting that flexoelectric spatial modulation plays a significant role in defining their light emission properties. These insights could, in principle, be extended to explain similar phenomena in the systems of many other metal halide perovskites. Our research provides valuable understanding into how phase transitions can be leveraged to extend exciton lifetimes and optimize charge carrier dynamics, potentially leading to advancements in the efficiency of solar cells and light-emitting devices.</p>}},
  author       = {{Pereira-Andrade, E. and Machado, M. V.H. and Lamers, Nils and Huang, Ziyun and Wallentin, Jesper and Malachias, A. and Cury, L. A. and Marçal, L. A.B. and Sáfar, G. A.M.}},
  issn         = {{1293-2558}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Solid State Sciences}},
  title        = {{Thermal effects on the dynamics of excitons in CsPb(Br<sub>1−x</sub>Cl<sub>x</sub>)<sub>3</sub>}},
  url          = {{http://dx.doi.org/10.1016/j.solidstatesciences.2025.108043}},
  doi          = {{10.1016/j.solidstatesciences.2025.108043}},
  volume       = {{168}},
  year         = {{2025}},
}