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Slower Auger Recombination in 12-Faceted Dodecahedron CsPbBr3 Nanocrystals

Ghosh, Supriya LU ; Pradhan, Bapi ; Lin, Weihua LU ; Zhang, Yiyue ; Leoncino, Luca ; Chabera, Pavel LU ; Zheng, Kaibo LU ; Solano, Eduardo ; Hofkens, Johan and Pullerits, Tõnu LU (2023) In Journal of Physical Chemistry Letters 14(4). p.1066-1072
Abstract

Over the past two decades, intensive research efforts have been devoted to suppressions of Auger recombination in metal-chalcogenide and perovskite nanocrystals (PNCs) for the application of photovoltaics and light emitting devices (LEDs). Here, we have explored dodecahedron cesium lead bromide perovskite nanocrystals (DNCs), which show slower Auger recombination time compared to hexahedron nanocrystals (HNCs). We investigate many-body interactions that are manifested under high excitation flux density in both NCs using ultrafast spectroscopic pump-probe measurements. We demonstrate that the Auger recombination rate due to multiexciton recombinations are lower in DNCs than in HNCs. At low and intermediate excitation density, the... (More)

Over the past two decades, intensive research efforts have been devoted to suppressions of Auger recombination in metal-chalcogenide and perovskite nanocrystals (PNCs) for the application of photovoltaics and light emitting devices (LEDs). Here, we have explored dodecahedron cesium lead bromide perovskite nanocrystals (DNCs), which show slower Auger recombination time compared to hexahedron nanocrystals (HNCs). We investigate many-body interactions that are manifested under high excitation flux density in both NCs using ultrafast spectroscopic pump-probe measurements. We demonstrate that the Auger recombination rate due to multiexciton recombinations are lower in DNCs than in HNCs. At low and intermediate excitation density, the majority of carriers recombine through biexcitonic recombination. However, at high excitation density (>1018 cm-3) a higher number of many-body Auger process dominates over biexcitonic recombination. Compared to HNCs, high PLQY and slower Auger recombinations in DNCs are likely to be significant for the fabrication of highly efficient perovskite-based photonics and LEDs.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry Letters
volume
14
issue
4
pages
7 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:36696665
  • scopus:85147168535
ISSN
1948-7185
DOI
10.1021/acs.jpclett.2c03389
language
English
LU publication?
yes
id
3f85d8f2-86cd-47a9-a5cc-07e90a8836d9
date added to LUP
2023-02-13 09:37:08
date last changed
2024-04-18 18:18:31
@article{3f85d8f2-86cd-47a9-a5cc-07e90a8836d9,
  abstract     = {{<p>Over the past two decades, intensive research efforts have been devoted to suppressions of Auger recombination in metal-chalcogenide and perovskite nanocrystals (PNCs) for the application of photovoltaics and light emitting devices (LEDs). Here, we have explored dodecahedron cesium lead bromide perovskite nanocrystals (DNCs), which show slower Auger recombination time compared to hexahedron nanocrystals (HNCs). We investigate many-body interactions that are manifested under high excitation flux density in both NCs using ultrafast spectroscopic pump-probe measurements. We demonstrate that the Auger recombination rate due to multiexciton recombinations are lower in DNCs than in HNCs. At low and intermediate excitation density, the majority of carriers recombine through biexcitonic recombination. However, at high excitation density (&gt;1018 cm-3) a higher number of many-body Auger process dominates over biexcitonic recombination. Compared to HNCs, high PLQY and slower Auger recombinations in DNCs are likely to be significant for the fabrication of highly efficient perovskite-based photonics and LEDs.</p>}},
  author       = {{Ghosh, Supriya and Pradhan, Bapi and Lin, Weihua and Zhang, Yiyue and Leoncino, Luca and Chabera, Pavel and Zheng, Kaibo and Solano, Eduardo and Hofkens, Johan and Pullerits, Tõnu}},
  issn         = {{1948-7185}},
  language     = {{eng}},
  number       = {{4}},
  pages        = {{1066--1072}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry Letters}},
  title        = {{Slower Auger Recombination in 12-Faceted Dodecahedron CsPbBr<sub>3</sub> Nanocrystals}},
  url          = {{http://dx.doi.org/10.1021/acs.jpclett.2c03389}},
  doi          = {{10.1021/acs.jpclett.2c03389}},
  volume       = {{14}},
  year         = {{2023}},
}