Journal
NANOPHOTONICS
Volume 10, Issue 8, Pages 1967-1975Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2020-0631
Keywords
bridge-barrier effect; CsPbBr3 nanocrystals; electron transfer; ligand-bridge
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Funding
- National Key R&D Program of China [2017YFA0207400]
- National Natural Science Foundation of China [61604032, 61905037]
- Fundamental Research Funds for the Central Universities of China [ZYGX2019J028]
- China Postdoctoral Science Foundation [2020M683281]
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This study successfully modulated the electron transfer rates from CsPbBr3 PeNCs to titanium dioxide films by using different surface ligands, and verified the ligand-bridge barrier effect through calculations. Transient absorption measurements confirmed the bridge-barrier effect, excluding carrier-delocalization effect of the naphthoic acid ligands. The research provides a perspective for designing composable and appropriate ligands for various practical purposes.
In most perovskite nanocrystal (PeNC)-based optoelectronic and photonic applications, surface ligands inevitably lead to a donor-bridge-acceptor charge transfer configuration. In this article, we demonstrate successful modulation of electron transfer (ET) rates from all-inorganic CsPbBr3 PeNCs to mesoporous titanium dioxide films, by using different surface ligands including single alkyl chain oleic acid and oleylamine, cross-linked insulating (3-aminopropyl)triethoxysilane and aromatic naphthoic acid molecules as the ligand-bridge. We systematically investigated the ET process through time-resolved photoluminescence spectroscopy. Calculations verified the ligand-bridge barrier effect of the three species upon the ET process. Transient absorption measurements excluded carrier-delocalization effect of the naphthoic acid ligands and confirmed the bridge-barrier effect. Our work provides a perspective for composable and appropriate ligands design for diverse practical purposes.
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