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Microscopic insight into the reversibility of photodegradation in MAPbI3 thin films

Merdasa, Aboma LU ; Tsarev, Sergey ; Akbulatov, Azat F. ; Troshin, Pavel and Unger, Eva L. LU (2020) In Journal of Luminescence 219.
Abstract

Whether optoelectronic devices based on metal-halide perovskite semiconductors will become a commercially viable technology will be determined by their intrinsic and operational stability. Recent results indicate there is some reversibility of perovskite degradation in thin films and devices, although mechanistic insight into the processes driving degradation and recovery are still scarce. We here present a comparative spectroscopic study of methylammonium lead iodide (MAPbI3) films having undergone either photo- or thermal degradation under controlled conditions. We confirm that the degradation mechanism pertaining to each type of stress is inherently different. Our results from photoluminescence microscopy measurements... (More)

Whether optoelectronic devices based on metal-halide perovskite semiconductors will become a commercially viable technology will be determined by their intrinsic and operational stability. Recent results indicate there is some reversibility of perovskite degradation in thin films and devices, although mechanistic insight into the processes driving degradation and recovery are still scarce. We here present a comparative spectroscopic study of methylammonium lead iodide (MAPbI3) films having undergone either photo- or thermal degradation under controlled conditions. We confirm that the degradation mechanism pertaining to each type of stress is inherently different. Our results from photoluminescence microscopy measurements paint a spatially, spectrally and temporarily resolved picture showing that, unlike thermally degraded samples, photodegraded samples are in a state that intermittently recovers to luminescent MAPbI3 upon laser excitation. This indicates that rather than irreversibly decomposing, photoinduced degradation leaves MAPbI3 structurally or compositionally intact but induces defects causing non-radiative recombination losses.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Luminescence
volume
219
article number
116916
publisher
Elsevier
external identifiers
  • scopus:85076573264
ISSN
0022-2313
DOI
10.1016/j.jlumin.2019.116916
language
English
LU publication?
yes
id
55fe2ad0-1286-4fb3-aef6-dfee952e5da6
date added to LUP
2020-01-02 13:00:54
date last changed
2020-01-08 08:58:14
@article{55fe2ad0-1286-4fb3-aef6-dfee952e5da6,
  abstract     = {<p>Whether optoelectronic devices based on metal-halide perovskite semiconductors will become a commercially viable technology will be determined by their intrinsic and operational stability. Recent results indicate there is some reversibility of perovskite degradation in thin films and devices, although mechanistic insight into the processes driving degradation and recovery are still scarce. We here present a comparative spectroscopic study of methylammonium lead iodide (MAPbI<sub>3</sub>) films having undergone either photo- or thermal degradation under controlled conditions. We confirm that the degradation mechanism pertaining to each type of stress is inherently different. Our results from photoluminescence microscopy measurements paint a spatially, spectrally and temporarily resolved picture showing that, unlike thermally degraded samples, photodegraded samples are in a state that intermittently recovers to luminescent MAPbI<sub>3</sub> upon laser excitation. This indicates that rather than irreversibly decomposing, photoinduced degradation leaves MAPbI<sub>3</sub> structurally or compositionally intact but induces defects causing non-radiative recombination losses.</p>},
  author       = {Merdasa, Aboma and Tsarev, Sergey and Akbulatov, Azat F. and Troshin, Pavel and Unger, Eva L.},
  issn         = {0022-2313},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {Journal of Luminescence},
  title        = {Microscopic insight into the reversibility of photodegradation in MAPbI<sub>3</sub> thin films},
  url          = {http://dx.doi.org/10.1016/j.jlumin.2019.116916},
  doi          = {10.1016/j.jlumin.2019.116916},
  volume       = {219},
  year         = {2020},
}