Aqueous Synthesis of Methylammonium Lead Halide Perovskite Nanocrystals

Chong Geng, Shu Xu*, Haizheng Zhong, Andrey L. Rogach, Wengang Bi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

91 Citations (Scopus)

Abstract

Methylammonium lead halide perovskite nanocrystals offer attractive optoelectronic properties but suffer from fast degradation in the presence of water. In contradiction to this observation, we demonstrate the possibility of a direct aqueous synthesis of CH3NH3PbX3 (X=Br or Cl/Br) nanocrystals through the reaction between the lead halide complex and methylamine when the pH is maintained in the range of 0–5. Under these synthetic conditions, the positively charged surface of the perovskite nanocrystals and the proper ionic balance help to prevent their decomposition in water. Additional surface capping with organic amine ligands further improves the photoluminescence quantum yield of the perovskite nanocrystals to values close to 40 %, ensures their stability under ambient conditions for several months, and their photoluminescence performance under continuous 0.1 W mm−2 405 nm light irradiation for over 250 hours.

Original languageEnglish
Pages (from-to)9650-9654
Number of pages5
JournalAngewandte Chemie - International Edition
Volume57
Issue number31
DOIs
Publication statusPublished - 26 Jul 2018

Keywords

  • aqueous synthesis
  • lead halide complexes
  • nanomaterials
  • pH
  • perovskite phases

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