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 language | American English |
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Article number | 204305 |
Number of pages | 5 |
Journal | The Journal of Chemical Physics |
Volume | 151 |
Issue number | 20 |
DOIs | |
State | Published - 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