Ligand-modulated electron transfer rates from CsPbBr 3 nanocrystals to titanium dioxide

Nanophotonics

article

Xiaochun Liu¹  Haifeng Zhao¹  Linfeng Wei¹  Xinjian Ren¹  Xinyang Zhang¹  Faming Li¹  Peng Zeng¹  Mingzhen Liu¹ 

[1] School of Materials and Energy, University of Electronic Science and Technology of China;Center for Applied Chemistry, University of Electronic Science and Technology of China

关键词: bridge-barrier effect;    CsPbBr3 nanocrystals;    electron transfer;    ligand-bridge;   

DOI  :  10.1515/nanoph-2020-0631

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 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.

【 授权许可】

CC BY