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Excitation wavelength dependence of photoluminescence flickering in degraded MAPbI3 perovskite and its connection to lead iodide formation

Kiligaridis, Alexander LU ; Merdasa, Aboma LU ; Rehermann, Carolin ; Unger, Eva L. LU and Scheblykin, Ivan G. LU (2020) In Journal of Luminescence 222.
Abstract

Metal halide perovskite semiconductors often exhibit photoluminescence blinking and flickering when luminescence of individual small nano- or even microcrystals is monitored. The nature of these fluctuations is not well understood but must be related to the presence of metastable non-radiative recombination channels and efficient charge migration in these materials. Here we report on the excitation wavelength dependence of photoluminescence flickering effect in degraded methylammonium lead iodide (MAPbI3) thin films. While the luminescence intensity is temporary stable when excited in the blue region with wavelength shorter than 530 nm, excitation with red light (wavelength longer than 530 nm) results in luminescence... (More)

Metal halide perovskite semiconductors often exhibit photoluminescence blinking and flickering when luminescence of individual small nano- or even microcrystals is monitored. The nature of these fluctuations is not well understood but must be related to the presence of metastable non-radiative recombination channels and efficient charge migration in these materials. Here we report on the excitation wavelength dependence of photoluminescence flickering effect in degraded methylammonium lead iodide (MAPbI3) thin films. While the luminescence intensity is temporary stable when excited in the blue region with wavelength shorter than 530 nm, excitation with red light (wavelength longer than 530 nm) results in luminescence flickering. It is hypothesised that the wavelength dependence reflects the excitation energy dependence of the photochemical mechanism that switches non-radiative recombination channels on and off. The effect can also be related to hindered charge carrier diffusion due to their localization in the interfacial layer between MAPbI3 and PbI2 which is formed in the course of degradation.

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; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Blinking, Degradation, Lead iodide, Luminescence excitation spectrum, Perovskite, Photoluminescence
in
Journal of Luminescence
volume
222
article number
117129
publisher
Elsevier
external identifiers
  • scopus:85081002066
ISSN
0022-2313
DOI
10.1016/j.jlumin.2020.117129
language
English
LU publication?
yes
id
3ddf3da0-a51e-4482-9f5f-c76779c16180
date added to LUP
2020-03-17 10:37:33
date last changed
2020-10-07 06:55:33
@article{3ddf3da0-a51e-4482-9f5f-c76779c16180,
  abstract     = {<p>Metal halide perovskite semiconductors often exhibit photoluminescence blinking and flickering when luminescence of individual small nano- or even microcrystals is monitored. The nature of these fluctuations is not well understood but must be related to the presence of metastable non-radiative recombination channels and efficient charge migration in these materials. Here we report on the excitation wavelength dependence of photoluminescence flickering effect in degraded methylammonium lead iodide (MAPbI<sub>3</sub>) thin films. While the luminescence intensity is temporary stable when excited in the blue region with wavelength shorter than 530 nm, excitation with red light (wavelength longer than 530 nm) results in luminescence flickering. It is hypothesised that the wavelength dependence reflects the excitation energy dependence of the photochemical mechanism that switches non-radiative recombination channels on and off. The effect can also be related to hindered charge carrier diffusion due to their localization in the interfacial layer between MAPbI<sub>3</sub> and PbI<sub>2</sub> which is formed in the course of degradation.</p>},
  author       = {Kiligaridis, Alexander 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        = {Excitation wavelength dependence of photoluminescence flickering in degraded MAPbI<sub>3</sub> perovskite and its connection to lead iodide formation},
  url          = {http://dx.doi.org/10.1016/j.jlumin.2020.117129},
  doi          = {10.1016/j.jlumin.2020.117129},
  volume       = {222},
  year         = {2020},
}