Pyridine-Induced Dimensionality Change in Hybrid Perovskite Nanocrystals

Ghada H. Ahmed, Jun Yin, Riya Bose, Lutfan Sinatra, Erkki Alarousu, Emre Yengel, Noktan M. Alyami, Makhsud I. Saidaminov, Yuhai Zhang, Mohamed N. Hedhili, Osman M. Bakr, Jean Luc Brédas, Omar F. Mohammed

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

Engineering the surface energy through careful manipulation of the surface chemistry is a convenient approach to control quantum confinement and structure dimensionality during nanocrystal growth. Here, we demonstrate that the introduction of pyridine during the synthesis of methylammonium lead bromide (MAPbBr3) perovskite nanocrystals can transform three-dimensional (3D) cubes into two-dimensional (2D) nanostructures. Density functional theory (DFT) calculations show that pyridine preferentially binds to Pb atoms terminating the surface, driving the selective 2D growth of the nanostructures. These 2D nanostructures exhibit strong quantum confinement effects, high photoluminescence quantum yields in the visible spectral range, and efficient charge transfer to molecular acceptors. These qualities indicate the suitability of the synthesized 2D nanostructures for a wide range of optoelectronic applications.

Original languageEnglish (US)
Pages (from-to)4393-4400
Number of pages8
JournalChemistry of Materials
Volume29
Issue number10
DOIs
StatePublished - May 23 2017
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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