journal article·2022-06-10Open access

Surface Stabilization of Colloidal Perovskite Nanocrystals via Multi-amine Chelating Ligands

Qingsen Zeng, Xiaoyu Zhang, Qiming Bing, Yuan Xiong, Fan Yang, Huiwen Liu, Jing-yao Liu, Hao Zhang, Weitao Zheng, Andrey L. Rogach, Bai Yang

ACS Energy Letters· Volume 7· Issue 6

Abstract

Developing pathways to stabilize the intrinsically dynamic surface of metal halide perovskite nanocrystals (PNCs), especially metastable lead iodide PNCs, is an important but challenging task. Herein, we have realized ultra-stable colloidal CsPbI3 PNCs based on a multi-amine chelating ligand, N′-(2-aminoethyl)-N′-hexadecylethane-1,2-diamine (AHDA). The protonated AHDA can anchor the PNC surface lattice with a high binding energy of 2.36 eV, much larger than the 1.47 eV achieved with the commonly used oleylammonium ligands. The chelation effect greatly inhibits dynamic desorption of surface ligands and enables stabilization of CsPbI3 PNCs under various ambient stimuli, such as repeated purification (up to 15 cycles), polar solvents, heat, and light. The stable yet easily accessible surface of the AHDA-capped CsPbI3 PNCs renders them a robust photocatalyst in a stereoselective C–C oxidative coupling reaction. Furthermore, we show that the AHDA ligand can also be used to synthesize PNCs of several other compositions, namely CsPbCl3, CsPbBr3, CsPbBrI2, and hybrid FAPbI3 (FA = formamidine), with remarkably stable emission characteristics.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Advanced Photocatalysis Techniques · Quantum Dots Synthesis And Properties

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

Affiliations

State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China

Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Electron Microscopy Center, Jilin University, Changchun 130012, P. R. China

Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, P. R. China

Department of Materials Science and Engineering and Centre for Functional Photonics (CFP), City University of Hong Kong, Hong Kong SAR 999077, P. R. China

Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, Hong Kong SAR 999077, China

Funding

Research Grants Council, University Grants Committee · Croucher Foundation · National Natural Science Foundation of China · JLU Science and Technology Innovative Research Team · International Postdoctoral Exchange Fellowship Program 2021

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