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Dmitry Baranov. Portrait.

Dmitry Baranov

Associate senior lecturer

Dmitry Baranov. Portrait.

Exogenous Metal Cations in the Synthesis of CsPbBr3 Nanocrystals and Their Interplay with Tertiary Amines

Author

  • Zhanzhao Li
  • Luca Goldoni
  • Ye Wu
  • Muhammad Imran
  • Yurii P. Ivanov
  • Giorgio Divitini
  • Juliette Zito
  • Iyyappa Rajan Panneerselvam
  • Dmitry Baranov
  • Ivan Infante
  • Luca De Trizio
  • Liberato Manna
Show all

Summary, in English

Current syntheses of CsPbBr3 halide perovskite nanocrystals (NCs) rely on overstoichiometric amounts of Pb2+ precursors, resulting in unreacted lead ions at the end of the process. In our synthesis scheme of CsPbBr3 NCs, we replaced excess Pb2+ with different exogenous metal cations (M) and investigated their effect on the synthesis products. These cations can be divided into two groups: group 1 delivers monodisperse CsPbBr3 cubes capped with oleate species (as for the case when Pb2+ is used in excess) and with a photoluminescence quantum yield (PLQY) as high as 90% with some cations (for example with M = In3+); group 2 yields irregularly shaped CsPbBr3 NCs with broad size distributions. In both cases, the addition of a tertiary ammonium cation (didodecylmethylammonium, DDMA+) during the synthesis, after the nucleation of the NCs, reshapes the NCs to monodisperse truncated cubes. Such NCs feature a mixed oleate/DDMA+ surface termination with PLQY values of up to 97%. For group 1 cations this happens only if the ammonium cation is directly added as a salt (DDMA-Br), while for group 2 cations this happens even if the corresponding tertiary amine (DDMA) is added, instead of DDMA-Br. This is attributed to the fact that only group 2 cations can facilitate the protonation of DDMA by the excess oleic acid present in the reaction environment. In all cases studied, the incorporation of M cations is marginal, and the reshaping of the NCs is only transient: if the reactions are run for a long time, the truncated cubes evolve to cubes.

Department/s

  • Chemical Physics
  • LU Profile Area: Light and Materials
  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • NanoLund: Centre for Nanoscience

Publishing year

2024-07-31

Language

English

Pages

20636-20648

Publication/Series

Journal of the American Chemical Society

Volume

146

Issue

30

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Materials Chemistry

Status

Published

ISBN/ISSN/Other

  • ISSN: 0002-7863