Enhanced Photoredox Activity of CsPbBr3 Nanocrystals by Quantitative Colloidal Ligand Exchange

Matthew Beard, Haipeng Lu, Xihan Chen, Elisa Link, Xiaolin Zhu, Collin Miller, Jovan Martin, Yong Yan

Research output: Contribution to journalArticlepeer-review

56 Scopus Citations

Abstract

Quantitative colloidal ligand exchange on lead-halide perovskite nanocrystals (NCs) has remained a challenge due to the dynamic passivation of amines and carboxylic acids and the instability of core lead-halide perovskite systems. Here, we present a facile colloidal ligand exchange process using cinnamate acid ligands to quantitatively displace native oleate ligands on CsPbBr3 NCs. The short cinnamate ligands lead to a 23-fold enhancement of the electron-donating ability of the CsPbBr3 NCs when benzoquinone is used as an electron acceptor. A significantly increased photoredox activity is also observed in a complete photocatalytic reaction: the α-alkylation of aldehydes. Our results provide a new strategy to tune the photoredox activity of halide perovskite NCs as well as the exploration of NC-ligand interactions.

Original languageAmerican English
Article number204305
Number of pages5
JournalThe Journal of Chemical Physics
Volume151
Issue number20
DOIs
StatePublished - 28 Nov 2019

Bibliographical note

Publisher Copyright:
© 2019 Author(s).

NREL Publication Number

  • NREL/JA-5900-74931

Keywords

  • ligand exchange
  • nanocrystals
  • Pb-halide perovskite nanocrystals
  • perovskites
  • photocatalysis
  • photoinduced electron transfer
  • photoluminescence spectroscopy
  • solar-photochemistry
  • tuning optoelectronic properties

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