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Impact of Excess Lead Iodide on the Recombination Kinetics in Metal Halide Perovskites

Merdasa, Aboma LU ; Kiligaridis, Alexander LU ; Rehermann, Carolin ; Abdi-Jalebi, Mojtaba ; Stöber, Jonas ; Louis, Boris LU ; Gerhard, Marina LU ; Stranks, Samuel D. ; Unger, Eva L. LU and Scheblykin, Ivan G. LU (2019) In ACS Energy Letters p.1370-1378
Abstract

Fundmental comprehension of light-induced processes in perovskites are still scarce. One active debate surrounds the influence of excess lead iodide (PbI2) on device performance, as well as optoelectronic properties, where both beneficial and detrimental traits have been reported. Here, we study its impact on charge carrier recombination kinetics by simultaneously acquiring the photoluminescence quantum yield and time-resolved photoluminescence as a function of excitation wavelength (450-780 nm). The presence of PbI2 in the perovskite film is identified via a unique spectroscopic signature in the PLQY spectrum. Probing the recombination in the presence and absence of this signature, we detect a radiative... (More)

Fundmental comprehension of light-induced processes in perovskites are still scarce. One active debate surrounds the influence of excess lead iodide (PbI2) on device performance, as well as optoelectronic properties, where both beneficial and detrimental traits have been reported. Here, we study its impact on charge carrier recombination kinetics by simultaneously acquiring the photoluminescence quantum yield and time-resolved photoluminescence as a function of excitation wavelength (450-780 nm). The presence of PbI2 in the perovskite film is identified via a unique spectroscopic signature in the PLQY spectrum. Probing the recombination in the presence and absence of this signature, we detect a radiative bimolecular recombination mechanism induced by PbI2. Spatially resolving the photoluminescence, we determine that this radiative process occurs in a small volume at the PbI2/perovskite interface, which is only active when charge carriers are generated in PbI2, and therefore provide deeper insight into how excess PbI2 may improve the properties of perovskite-based devices.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
ACS Energy Letters
pages
9 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85066890331
ISSN
2380-8195
DOI
10.1021/acsenergylett.9b00774
language
English
LU publication?
yes
id
e8c98ab7-da40-4456-9dc6-5c1aa4951687
date added to LUP
2019-06-24 14:16:06
date last changed
2020-02-26 07:30:16
@article{e8c98ab7-da40-4456-9dc6-5c1aa4951687,
  abstract     = {<p>Fundmental comprehension of light-induced processes in perovskites are still scarce. One active debate surrounds the influence of excess lead iodide (PbI<sub>2</sub>) on device performance, as well as optoelectronic properties, where both beneficial and detrimental traits have been reported. Here, we study its impact on charge carrier recombination kinetics by simultaneously acquiring the photoluminescence quantum yield and time-resolved photoluminescence as a function of excitation wavelength (450-780 nm). The presence of PbI<sub>2</sub> in the perovskite film is identified via a unique spectroscopic signature in the PLQY spectrum. Probing the recombination in the presence and absence of this signature, we detect a radiative bimolecular recombination mechanism induced by PbI<sub>2</sub>. Spatially resolving the photoluminescence, we determine that this radiative process occurs in a small volume at the PbI<sub>2</sub>/perovskite interface, which is only active when charge carriers are generated in PbI<sub>2</sub>, and therefore provide deeper insight into how excess PbI<sub>2</sub> may improve the properties of perovskite-based devices.</p>},
  author       = {Merdasa, Aboma and Kiligaridis, Alexander and Rehermann, Carolin and Abdi-Jalebi, Mojtaba and Stöber, Jonas and Louis, Boris and Gerhard, Marina and Stranks, Samuel D. and Unger, Eva L. and Scheblykin, Ivan G.},
  issn         = {2380-8195},
  language     = {eng},
  pages        = {1370--1378},
  publisher    = {The American Chemical Society (ACS)},
  series       = {ACS Energy Letters},
  title        = {Impact of Excess Lead Iodide on the Recombination Kinetics in Metal Halide Perovskites},
  url          = {http://dx.doi.org/10.1021/acsenergylett.9b00774},
  doi          = {10.1021/acsenergylett.9b00774},
  year         = {2019},
}