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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Lead-Free Silver-Bismuth Halide Double Perovskite Nanocrystals

Author

  • Bin Yang
  • Junsheng Chen
  • Songqiu Yang
  • Feng Hong
  • Lei Sun
  • Peigeng Han
  • Tõnu Pullerits
  • Weiqiao Deng
  • Keli Han

Summary, in English

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.

Department/s

  • Chemical Physics
  • NanoLund: Center for Nanoscience

Publishing year

2018-05-04

Language

English

Pages

5359-5363

Publication/Series

Angewandte Chemie - International Edition

Volume

57

Issue

19

Document type

Journal article

Publisher

John Wiley & Sons Inc.

Topic

  • Physical Chemistry
  • Condensed Matter Physics

Keywords

  • bismuth
  • charge carriers
  • double perovskites
  • nanocrystals
  • silver

Status

Published

ISBN/ISSN/Other

  • ISSN: 1433-7851