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Dmitry Baranov. Portrait.

Dmitry Baranov

Associate senior lecturer

Dmitry Baranov. Portrait.

Shape-Pure, Nearly Monodispersed CsPbBr3 Nanocubes Prepared Using Secondary Aliphatic Amines

Author

  • Muhammad Imran
  • Palvasha Ijaz
  • Dmitry Baranov
  • Luca Goldoni
  • Urko Petralanda
  • Quinten Akkerman
  • Ahmed L. Abdelhady
  • Mirko Prato
  • Paolo Bianchini
  • Ivan Infante
  • Liberato Manna
Show all

Summary, in English

Fully inorganic cesium lead halide perovskite (CsPbX3) nanocrystals (NCs) have been extensively studied due to their excellent optical properties, especially their high photoluminescence quantum yield (PLQY) and the ease with which the PL can be tuned across the visible spectrum. So far, most strategies for synthesizing CsPbX3 NCs are highly sensitive to the processing conditions and ligand combinations. For example, in the synthesis of nanocubes of different sizes, it is not uncommon to have samples that contain various other shapes, such as nanoplatelets and nanosheets. Here, we report a new colloidal synthesis method for preparing shape-pure and nearly monodispersed CsPbBr3 nanocubes using secondary amines. Regardless of the length of the alkyl chains, the oleic acid concentration, and the reaction temperature, only cube-shaped NCs were obtained. The shape purity and narrow size distribution of the nanocubes are evident from their sharp excitonic features and their ease of self-assembly in superlattices, reaching lateral dimensions of up to 50 μm. We attribute this excellent shape and phase purity to the inability of secondary amines to find the right steric conditions at the surface of the NCs, which consequently limits the formation of low-dimensional structures. Furthermore, no contamination from other phases was observed, not even from Cs4PbBr6, presumably due to the poor ability of secondary aliphatic amines to coordinate to PbBr2 and, hence, to provide a reaction environment that is depleted in Pb.

Publishing year

2018-12-12

Language

English

Pages

7822-7831

Publication/Series

Nano Letters

Volume

18

Issue

12

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Keywords

  • colloidal synthesis
  • inorganic metal halides
  • nanocubes
  • perovskites
  • Secondary amines
  • superlattices

Status

Published

ISBN/ISSN/Other

  • ISSN: 1530-6984