Pb deficiency enables the synthesis of CsPbI3 nanosheets with tunable thickness down to two octahedral layers

Weilin Zheng, Jiangkun Chen, Yang Guo, Xin Zhang, Fengjun Chun, Yaxin Cao, Xiaoping Gao, Hao Suo, Xiaohe Wei, Zhifeng Xing, Yanze Wang and Feng Wang ()
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Weilin Zheng: City University of Hong Kong
Jiangkun Chen: City University of Hong Kong
Yang Guo: City University of Hong Kong
Xin Zhang: City University of Hong Kong
Fengjun Chun: City University of Hong Kong
Yaxin Cao: City University of Hong Kong
Xiaoping Gao: Ningbo University of Technology
Hao Suo: City University of Hong Kong
Xiaohe Wei: City University of Hong Kong
Zhifeng Xing: City University of Hong Kong
Yanze Wang: City University of Hong Kong
Feng Wang: City University of Hong Kong

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract CsPbX3 (X = Cl, Br, I) nanosheets have emerged as a promising platform for tuning quantum confinement effects and achieving efficient optoelectronic devices. However, synthesizing uniform CsPbX3 nanosheets with monolayer-level thicknesses remains a challenge due to the fast reaction kinetics. Herein, we develop a synthetic strategy that leverages Pb-deficient precursors to control reaction kinetics. Our experimental investigations indicate that Pb deficiency in the precursors decelerates the crystal growth, offering enhanced dimensional control in CsPbX3 systems. This approach enables the synthesis of uniform CsPbI3 nanosheets with tunable thickness down to two octahedral layers, which exhibit a narrowband emission at 563 nm and high stability against spectral drift. This method is readily extended to CsPbBr3 and CsPbCl3 systems for precise size and shape modulation, thus affording full-color emission tuning within mono-halide perovskites. These findings establish a versatile synthetic strategy poised to advance the design and application of CsPbX3 nanomaterials and other colloidal nanocrystals.

Date: 2025
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DOI: 10.1038/s41467-025-65050-1

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