In Situ TEM Monitoring of Phase-Segregation in Inorganic Mixed Halide Perovskite
(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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- author
- Funk, Hannah ; Shargaieva, Oleksandra ; Eljarrat, Alberto ; Unger, Eva L. LU ; Koch, Christoph T. and Abou-Ras, Daniel
- publishing date
- 2020
- 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
-
- scopus:85087534114
- pmid:32486642
- 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
- 2024-09-20 14:30:31
@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}}, }