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Lead-Free Silver-Bismuth Halide Double Perovskite Nanocrystals

Yang, Bin; Chen, Junsheng LU ; Yang, Songqiu; Hong, Feng; Sun, Lei; Han, Peigeng; Pullerits, Tõnu LU ; Deng, Weiqiao and Han, Keli (2018) In Angewandte Chemie - International Edition 57(19). p.5359-5363
Abstract

Lead-free perovskite nanocrystals (NCs) were obtained mainly by substituting a Pb2+ cation with a divalent cation or substituting three Pb2+ cations with two trivalent cations. The substitution of two Pb2+ cations with one monovalent Ag+ and one trivalent Bi3+ cations was used to synthesize Cs2AgBiX6 (X=Cl, Br, I) double perovskite NCs. Using femtosecond transient absorption spectroscopy, the charge carrier relaxation mechanism was elucidated in the double perovskite NCs. The Cs2AgBiBr6 NCs exhibit ultrafast hot-carrier cooling (<1 ps), which competes with the carrier trapping processes (mainly originate from the surface defects).... (More)

Lead-free perovskite nanocrystals (NCs) were obtained mainly by substituting a Pb2+ cation with a divalent cation or substituting three Pb2+ cations with two trivalent cations. The substitution of two Pb2+ cations with one monovalent Ag+ and one trivalent Bi3+ cations was used to synthesize Cs2AgBiX6 (X=Cl, Br, I) double perovskite NCs. Using femtosecond transient absorption spectroscopy, the charge carrier relaxation mechanism was elucidated in the double perovskite NCs. The Cs2AgBiBr6 NCs exhibit ultrafast hot-carrier cooling (<1 ps), which competes with the carrier trapping processes (mainly originate from the surface defects). Notably, the photoluminescence can be increased by 100 times with surfactant (oleic acid) added to passivate the defects in Cs2AgBiCl6 NCs. These results suggest that the double perovskite NCs could be potential materials for optoelectronic applications by better controlling the surface defects.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
bismuth, charge carriers, double perovskites, nanocrystals, silver
in
Angewandte Chemie - International Edition
volume
57
issue
19
pages
5 pages
publisher
John Wiley & Sons
external identifiers
  • scopus:85044405336
ISSN
1433-7851
DOI
10.1002/anie.201800660
language
English
LU publication?
yes
id
c96762cb-978e-41c2-bc10-610982f1d9f4
date added to LUP
2018-05-22 14:14:43
date last changed
2019-03-17 05:06:07
@article{c96762cb-978e-41c2-bc10-610982f1d9f4,
  abstract     = {<p>Lead-free perovskite nanocrystals (NCs) were obtained mainly by substituting a Pb<sup>2+</sup> cation with a divalent cation or substituting three Pb<sup>2+</sup> cations with two trivalent cations. The substitution of two Pb<sup>2+</sup> cations with one monovalent Ag<sup>+</sup> and one trivalent Bi<sup>3+</sup> cations was used to synthesize Cs<sub>2</sub>AgBiX<sub>6</sub> (X=Cl, Br, I) double perovskite NCs. Using femtosecond transient absorption spectroscopy, the charge carrier relaxation mechanism was elucidated in the double perovskite NCs. The Cs<sub>2</sub>AgBiBr<sub>6</sub> NCs exhibit ultrafast hot-carrier cooling (&lt;1 ps), which competes with the carrier trapping processes (mainly originate from the surface defects). Notably, the photoluminescence can be increased by 100 times with surfactant (oleic acid) added to passivate the defects in Cs<sub>2</sub>AgBiCl<sub>6</sub> NCs. These results suggest that the double perovskite NCs could be potential materials for optoelectronic applications by better controlling the surface defects.</p>},
  author       = {Yang, Bin and Chen, Junsheng and Yang, Songqiu and Hong, Feng and Sun, Lei and Han, Peigeng and Pullerits, Tõnu and Deng, Weiqiao and Han, Keli},
  issn         = {1433-7851},
  keyword      = {bismuth,charge carriers,double perovskites,nanocrystals,silver},
  language     = {eng},
  month        = {05},
  number       = {19},
  pages        = {5359--5363},
  publisher    = {John Wiley & Sons},
  series       = {Angewandte Chemie - International Edition},
  title        = {Lead-Free Silver-Bismuth Halide Double Perovskite Nanocrystals},
  url          = {http://dx.doi.org/10.1002/anie.201800660},
  volume       = {57},
  year         = {2018},
}