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Self-Healing Ability of Perovskites Observed via Photoluminescence Response on Nanoscale Local Forces and Mechanical Damage

Galle, Marco H.J.J. ; Li, Jun LU orcid ; Frantsuzov, Pavel A. LU ; Basché, Thomas and Scheblykin, Ivan G. LU orcid (2023) In Advanced Science 10(1).
Abstract

The photoluminescence (PL) of metal halide perovskites can recover after light or current-induced degradation. This self-healing ability is tested by acting mechanically on MAPbI3 polycrystalline microcrystals by an atomic force microscope tip (applying force, scratching, and cutting) while monitoring the PL. Although strain and crystal damage induce strong PL quenching, the initial balance between radiative and nonradiative processes in the microcrystals is restored within a few minutes. The stepwise quenching–recovery cycles induced by the mechanical action is interpreted as a modulation of the PL blinking behavior. This study proposes that the dynamic equilibrium between active and inactive states of the metastable... (More)

The photoluminescence (PL) of metal halide perovskites can recover after light or current-induced degradation. This self-healing ability is tested by acting mechanically on MAPbI3 polycrystalline microcrystals by an atomic force microscope tip (applying force, scratching, and cutting) while monitoring the PL. Although strain and crystal damage induce strong PL quenching, the initial balance between radiative and nonradiative processes in the microcrystals is restored within a few minutes. The stepwise quenching–recovery cycles induced by the mechanical action is interpreted as a modulation of the PL blinking behavior. This study proposes that the dynamic equilibrium between active and inactive states of the metastable nonradiative recombination centers causing blinking is perturbed by strain. Reversible stochastic transformation of several nonradiative centers per microcrystal under application/release of the local stress can lead to the observed PL quenching and recovery. Fitting the experimental PL trajectories by a phenomenological model based on viscoelasticity provides a characteristic time of strain relaxation in MAPbI3 on the order of 10–100 s. The key role of metastable defect states in nonradiative losses and in the self-healing properties of perovskites is suggested.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
defects, metastability, photoluminescence, self-healing, strain
in
Advanced Science
volume
10
issue
1
article number
2204393
publisher
John Wiley & Sons Inc.
external identifiers
  • pmid:36453591
  • scopus:85143392577
ISSN
2198-3844
DOI
10.1002/advs.202204393
language
English
LU publication?
yes
id
84de9c93-f346-4334-bed0-3d755e14a5fe
date added to LUP
2023-01-30 12:40:02
date last changed
2025-05-12 18:23:06
@article{84de9c93-f346-4334-bed0-3d755e14a5fe,
  abstract     = {{<p>The photoluminescence (PL) of metal halide perovskites can recover after light or current-induced degradation. This self-healing ability is tested by acting mechanically on MAPbI<sub>3</sub> polycrystalline microcrystals by an atomic force microscope tip (applying force, scratching, and cutting) while monitoring the PL. Although strain and crystal damage induce strong PL quenching, the initial balance between radiative and nonradiative processes in the microcrystals is restored within a few minutes. The stepwise quenching–recovery cycles induced by the mechanical action is interpreted as a modulation of the PL blinking behavior. This study proposes that the dynamic equilibrium between active and inactive states of the metastable nonradiative recombination centers causing blinking is perturbed by strain. Reversible stochastic transformation of several nonradiative centers per microcrystal under application/release of the local stress can lead to the observed PL quenching and recovery. Fitting the experimental PL trajectories by a phenomenological model based on viscoelasticity provides a characteristic time of strain relaxation in MAPbI<sub>3</sub> on the order of 10–100 s. The key role of metastable defect states in nonradiative losses and in the self-healing properties of perovskites is suggested.</p>}},
  author       = {{Galle, Marco H.J.J. and Li, Jun and Frantsuzov, Pavel A. and Basché, Thomas and Scheblykin, Ivan G.}},
  issn         = {{2198-3844}},
  keywords     = {{defects; metastability; photoluminescence; self-healing; strain}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Advanced Science}},
  title        = {{Self-Healing Ability of Perovskites Observed via Photoluminescence Response on Nanoscale Local Forces and Mechanical Damage}},
  url          = {{http://dx.doi.org/10.1002/advs.202204393}},
  doi          = {{10.1002/advs.202204393}},
  volume       = {{10}},
  year         = {{2023}},
}