journal article·2026-02-24

Bifunctional Ligand Strategy for Suppressing Perovskite Quantum Dot Defects and Enhancing Photodetector Performance

Wei Yan, Jia Sun, Linze Xie, Zusheng Lin, Yongbing Zhao, Yihua Zhu, Jianhua Shen

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Abstract

Although lead halide perovskite nanocrystals are promising for optoelectronic device applications, the instability of quantum dots and the low carrier transport efficiency of conventional long-chain ligands seriously hinder their further applications. To overcome these limitations, the terminal bifunctional ligands passivation strategy is employed in this paper to explore the effects of varying chain lengths, flexibilities, and conjugation degrees on carrier transport. The findings demonstrate that bifunctional ligands can form connections between quantum dots. However, excessive chain length or low flexibility will result in an increase in defects and a decrease in the carrier transport efficiency between quantum dots. Methylammonium succinate ligands were selected to passivate the defects on the surface of the quantum dots while increasing the carrier-transfer efficiency between the quantum dots, allowing them to provide photodetector responsivities that are 96 times higher than those of conventional oleic acid-passivated quantum dots.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Organic Light-Emitting Diodes Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Shanghai Engineering Research Centre of Hierarchical Nanomaterials, Key Laboratory for Ultrafine Materials of Ministry of Education, Frontiers Science Centre for Materiobiology and Dynamic Chemistry, School of Materials Science and Engineering

East China University of Science and Technology

National Key Laboratory of Infrared Detection Technologies

Shanghai Institute of Technical Physics, Chinese Academy of Sciences

School of Physics and Electronics Engineering

Yancheng Teachers University

Funding

Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning · Shanghai Institute of Technical Physics, Chinese Academy of Sciences · Science and Technology Commission of Shanghai Municipality · Fundamental Research Funds for the Central Universities · National Natural Science Foundation of China · Shanghai Super Postdoc Incentive Plan

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