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Research Article

Microfluidic synthesis of hollow CsPbBr3 perovskite nanocrystals through the nanoscale Kirkendall effect

Yue Chen1, Xiaoyu Zhang1, Jinzhou Jiang2, Gaoyu Chen1,3, Kunhong Zhou1, Xinwen Zhang2( ), Fajing Li4, Caojin Yuan4, Jianchun Bao1, Xiangxing Xu1,5( )
Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
Key Laboratory for Organic Electronics and Information Displays, Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Frontiers Science Center for Flexible Electronics, Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, Xi’an 710072, China
Jiangsu Key Laboratory for Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China
State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
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Graphical Abstract

Hollow CsPbBr3 perovskite nanocrystals exhibiting unique optoelectronic properties were successfully synthesized by a microfluidic approach. The formation of the cavity within the nanocrystals complies with the mechanism of the nanoscale Kirkendall effect.

Abstract

All inorganic metal halide perovskite nanocrystals (NCs) have attracted much attention for their outstanding optoelectronic properties, which can be tuned by the composition, surface, size and morphology in nanoscale. Herein, we report the microfluidic synthesis of hollow CsPbBr3 perovskite NCs through the nanoscale Kirkendall effect. The formation mechanism of the hollow structure (Kirkendall void) controlled by the temperature, flow rate, ratios of precursors and ligands was investigated. Compared with the solid CsPbBr3 NCs of the same size, the hollow CsPbBr3 NCs exhibit blue shifts in ultraviolet−visible (UV−vis) absorption and photoluminescence (PL) spectra, and remarkably longer PL average lifetime (~ 98.2 ns). Quantum confinement effect, inner surface induced additional trap states and lattice strain of the hollow CsPbBr3 NCs were discussed in understanding their unique optoelectronic properties. The hollow CsPbBr3 NC based photodetector exhibits an outstanding negative photoconductivity (NPC) detectivity of 8.9 × 1012 Jones. They also show potentials in perovskite NC based photovoltaic and light emitting diodes (LEDs).

Keywords

perovskite nanocrystalshollow nanocrystalsnanoscale Kirkendall effectmicrofluidic synthesis

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Nano Research
Volume 17 Issue 9,
September 2024
Pages 8487-8494
DOI: 10.1007/s12274-024-6786-z
Cite this article:
Chen Y, Zhang X, Jiang J, et al. Microfluidic synthesis of hollow CsPbBr3 perovskite nanocrystals through the nanoscale Kirkendall effect. Nano Research, 2024, 17(9): 8487-8494. https://doi.org/10.1007/s12274-024-6786-z
Topics:
NanocrystalsSemiconductor quantum dots

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Received: 30 March 2024
Revised: 12 May 2024
Accepted: 26 May 2024
Published: 01 July 2024
© Tsinghua University Press 2024
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