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Complex evolution of photoluminescence during phase segregation of MAPb(I1-xBrx)3 mixed halide perovskite

Suchan, Klara LU ; Merdasa, Aboma LU ; Rehermann, Carolin ; Unger, Eva L. LU and Scheblykin, Ivan G. LU (2020) In Journal of Luminescence 221.
Abstract

Under illumination, the photoluminescence of a mixed-halide perovskite such as MAPb(I1-xBrx)3 is known to undergo a significant intensity enhancement while spectrally shifting to lower energies. The evolution of low energy photoluminescence is attributed to the formation of iodide rich domains due to phase segregation. This process is detrimental for optoelectronic devices however the mechanism is not well-understood. Here we present a real-time study of the photoluminescence evolution in MAPb(I1-xBrx)3 samples during light-induced phase segregation. We show that the evolution of photoluminescence proceeds via several intermediate stages making it more complex than... (More)

Under illumination, the photoluminescence of a mixed-halide perovskite such as MAPb(I1-xBrx)3 is known to undergo a significant intensity enhancement while spectrally shifting to lower energies. The evolution of low energy photoluminescence is attributed to the formation of iodide rich domains due to phase segregation. This process is detrimental for optoelectronic devices however the mechanism is not well-understood. Here we present a real-time study of the photoluminescence evolution in MAPb(I1-xBrx)3 samples during light-induced phase segregation. We show that the evolution of photoluminescence proceeds via several intermediate stages making it more complex than previously suggested. Within the first few seconds of photo-excitation, we found a very rapid formation of a short-lived intense photoluminescence band with a peak energy even lower than the final emission of the fully segregated sample. We propose that this emission comes from small pure iodide nano-domains formed during the initial stage of photo-induced phase-segregation.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Luminescence
volume
221
article number
117073
publisher
Elsevier
external identifiers
  • scopus:85078872437
ISSN
0022-2313
DOI
10.1016/j.jlumin.2020.117073
language
English
LU publication?
yes
id
3b65d140-6ee8-47e0-8fab-3e2f2c78d6d4
date added to LUP
2020-02-14 09:28:20
date last changed
2020-02-26 07:41:48
@article{3b65d140-6ee8-47e0-8fab-3e2f2c78d6d4,
  abstract     = {<p>Under illumination, the photoluminescence of a mixed-halide perovskite such as MAPb(I<sub>1-x</sub>Br<sub>x</sub>)<sub>3</sub> is known to undergo a significant intensity enhancement while spectrally shifting to lower energies. The evolution of low energy photoluminescence is attributed to the formation of iodide rich domains due to phase segregation. This process is detrimental for optoelectronic devices however the mechanism is not well-understood. Here we present a real-time study of the photoluminescence evolution in MAPb(I<sub>1-x</sub>Br<sub>x</sub>)<sub>3</sub> samples during light-induced phase segregation. We show that the evolution of photoluminescence proceeds via several intermediate stages making it more complex than previously suggested. Within the first few seconds of photo-excitation, we found a very rapid formation of a short-lived intense photoluminescence band with a peak energy even lower than the final emission of the fully segregated sample. We propose that this emission comes from small pure iodide nano-domains formed during the initial stage of photo-induced phase-segregation.</p>},
  author       = {Suchan, Klara and Merdasa, Aboma and Rehermann, Carolin and Unger, Eva L. and Scheblykin, Ivan G.},
  issn         = {0022-2313},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {Journal of Luminescence},
  title        = {Complex evolution of photoluminescence during phase segregation of MAPb(I<sub>1-x</sub>Br<sub>x</sub>)<sub>3</sub> mixed halide perovskite},
  url          = {http://dx.doi.org/10.1016/j.jlumin.2020.117073},
  doi          = {10.1016/j.jlumin.2020.117073},
  volume       = {221},
  year         = {2020},
}