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Research Article

Defect-modulated synthesis and optoelectronic properties in chemical vapor deposited CsPbBr3 microplates

Yanan Bao1,§, Hengshan Wang1,§, Meiqi An1, Huayi Tang1, Jing Li1,2, Jianliang Li1, Conghui Tan1, Yingmin Luo1, Jiao Xu1( ), Yiming Yang1( )
School of Microelectronics, Dalian University of Technology, Dalian 116024, China
Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, China

§ Yanan Bao and Hengshan Wang contributed equally to this work.

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Graphical Abstract

The microplate synthesis is initiated by defects, followed by transition to layer-by-layer growth, resulting in anomalous annealing effect on the luminescence and optoelectronic performance.

Abstract

The remarkable optoelectronic features of halide perovskite promote their potential applications in semiconductor devices beyond solar cells, which require high-quality single crystals with controlled defect levels. Herein, we investigated the synthesis mechanism of chemical vapor deposited single-crystalline all-inorganic perovskite microplates (MPs), and reported a defect-modulated photocurrent which is closely related to the growth sequence of the MPs. The MP synthesis initiates from island-like nano-disks, and subsequently transits to a layer-by-layer fashion, resulting in a defect-rich area at the center of the MPs. At elevated temperatures, these central defects may be thermally activated and become highly mobile, leading to photoluminescence quenching and degression of local and overall optoelectronic attributes, as evidenced by the spatial resolved optical and electrical scanning probe microscopy. Overall, this work shines light on the formation, proliferation and dynamics of defects in perovskites, and offers guidance for preparation of high-quality perovskites micro-crystals for functional semiconductor devices with high temperature stability.

Keywords

halide perovskitesnanomaterialsoptoelectronicsscanning photocurrent microscopechemical vapor deposition

Electronic Supplementary Material

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12274_2023_6307_MOESM1_ESM.pdf (1.2 MB)

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Nano Research
Volume 17 Issue 5,
May 2024
Pages 4610-4615
DOI: 10.1007/s12274-023-6307-5
Cite this article:
Bao Y, Wang H, An M, et al. Defect-modulated synthesis and optoelectronic properties in chemical vapor deposited CsPbBr3 microplates. Nano Research, 2024, 17(5): 4610-4615. https://doi.org/10.1007/s12274-023-6307-5
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Received: 17 August 2023
Revised: 02 November 2023
Accepted: 11 November 2023
Published: 02 December 2023
© Tsinghua University Press 2023
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