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In Situ TEM Monitoring of Phase-Segregation in Inorganic Mixed Halide Perovskite

Funk, Hannah ; Shargaieva, Oleksandra ; Eljarrat, Alberto ; Unger, Eva L. LU ; Koch, Christoph T. and Abou-Ras, Daniel (2020) In Journal of Physical Chemistry Letters 11(13). p.4945-4950
Abstract

Photoinduced phase separation, which limits the available band gap energies for photovoltaic applications, was reported for a range of mixed-halide perovskites. A microscopic understanding of the phase separation mechanism is still lacking but may be beneficial to rationalize limitations as well as enable the design of phase-stable perovskite semiconductors. In this letter, electron-beam-induced phase separations and transformations were investigated in a small crystallite of CsPb(Br0.8I0.2)3 by means of in situ high-resolution imaging in a transmission electron microscope. The acquired time series was evaluated using principal and independent component analysis to classify the structural change during... (More)

Photoinduced phase separation, which limits the available band gap energies for photovoltaic applications, was reported for a range of mixed-halide perovskites. A microscopic understanding of the phase separation mechanism is still lacking but may be beneficial to rationalize limitations as well as enable the design of phase-stable perovskite semiconductors. In this letter, electron-beam-induced phase separations and transformations were investigated in a small crystallite of CsPb(Br0.8I0.2)3 by means of in situ high-resolution imaging in a transmission electron microscope. The acquired time series was evaluated using principal and independent component analysis to classify the structural change during the illumination by the electron beam. A more iodine-rich phase with the approximate composition of CsPb(Br0.6I0.4)3 was found to form at the edges of the particle, while a ternary pure bromide phase of CsPbBr3 remained at its center. These results provide an atomistic picture of in-grain phase segregation into iodide-rich phases at grain boundaries and bromide-rich phases in the interior of the grain.

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publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry Letters
volume
11
issue
13
pages
6 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:32486642
  • scopus:85087534114
ISSN
1948-7185
DOI
10.1021/acs.jpclett.0c01296
language
English
LU publication?
no
id
d5191599-d47c-42c9-8b61-ca5f535cb825
date added to LUP
2021-01-22 16:33:31
date last changed
2024-06-14 08:43:41
@article{d5191599-d47c-42c9-8b61-ca5f535cb825,
  abstract     = {{<p>Photoinduced phase separation, which limits the available band gap energies for photovoltaic applications, was reported for a range of mixed-halide perovskites. A microscopic understanding of the phase separation mechanism is still lacking but may be beneficial to rationalize limitations as well as enable the design of phase-stable perovskite semiconductors. In this letter, electron-beam-induced phase separations and transformations were investigated in a small crystallite of CsPb(Br<sub>0.8</sub>I<sub>0.2</sub>)<sub>3</sub> by means of in situ high-resolution imaging in a transmission electron microscope. The acquired time series was evaluated using principal and independent component analysis to classify the structural change during the illumination by the electron beam. A more iodine-rich phase with the approximate composition of CsPb(Br<sub>0.6</sub>I<sub>0.4</sub>)<sub>3</sub> was found to form at the edges of the particle, while a ternary pure bromide phase of CsPbBr<sub>3</sub> remained at its center. These results provide an atomistic picture of in-grain phase segregation into iodide-rich phases at grain boundaries and bromide-rich phases in the interior of the grain. </p>}},
  author       = {{Funk, Hannah and Shargaieva, Oleksandra and Eljarrat, Alberto and Unger, Eva L. and Koch, Christoph T. and Abou-Ras, Daniel}},
  issn         = {{1948-7185}},
  language     = {{eng}},
  number       = {{13}},
  pages        = {{4945--4950}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry Letters}},
  title        = {{In Situ TEM Monitoring of Phase-Segregation in Inorganic Mixed Halide Perovskite}},
  url          = {{http://dx.doi.org/10.1021/acs.jpclett.0c01296}},
  doi          = {{10.1021/acs.jpclett.0c01296}},
  volume       = {{11}},
  year         = {{2020}},
}