文章基本信息

标题：Ligand-modulated electron transfer rates from CsPbBr 3 nanocrystals to titanium dioxide
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作者：Xiaochun Liu ; Haifeng Zhao ; Linfeng Wei 等
期刊名称：Nanophotonics
印刷版ISSN：2192-8606
电子版ISSN：2192-8614
出版年度：2021
页码：1967–1975
DOI：10.1515/nanoph-2020-0631
出版社：Walter de Gruyter GmbH
摘要：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 CsPbBr 3 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.
关键词：bridge-barrier effect; CsPbBr3 nanocrystals; electron transfer; ligand-bridge.