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Nano Research 2022, 15(4): 3621-3627 https://doi.org/10.1007/s12274-021-3907-9
Research Article | Issue | Published: 10 December 2021

Direct drop-casting synthesis of all-inorganic lead and lead-free halide perovskite microcrystals for high-performance photodetectors

Show Author's Information Zhengxun Lai1,  You Meng1,  Fei Wang1,2,3,  Xiuming Bu1,  Wei Wang1,3,  Pengshan Xie1,  Weijun Wang1,  Chuntai Liu4,  SenPo Yip1,5,  Johnny C. Ho1,3,5( )
Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong 999077, China
State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130021, China
State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Kowloon, Hong Kong 999077, China
Key Laboratory of Advanced Materials Processing & Mold (Zhengzhou University), Ministry of Education, Zhengzhou 450002, China
Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka 816–8580, Japan
Keywords:
photodetector, CsPbBr3, drop-casting, Cs3Sb2I9, halide perovskite
Topics:
Photoelectrons
Cite this article:
Lai Z, Meng Y, Wang F, et al. Direct drop-casting synthesis of all-inorganic lead and lead-free halide perovskite microcrystals for high-performance photodetectors. Nano Research, 2022, 15(4): 3621-3627. https://doi.org/10.1007/s12274-021-3907-9
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Abstract Full text Electronic supplementary material About this article

Due to the exciting photoelectric properties, better stability, and environmental-friendly nature, all-inorganic halide perovskites (AIHPs), especially the lead-free perovskites, have attracted worldwide attention. However, the film quality of AIHPs fabricated by typical spin-coating and subsequent high-temperature annealing is still not satisfactory, restricting their further development. Herein, we demonstrate a simple low-temperature solution-processed drop-casting method to achieve highly-crystalline cubic CsPbBr3 and lead-free layer-structured Cs3Sb2I9 microcrystals (MCs). This drop-casting technique not only consumes the less amount of precursor solution but also eliminates the high-temperature annealing as compared with those of spin coating. When these MCs are configured into photodetectors, they exhibit superior device performance, which is in distinct contrast to the one of spin-coated counterparts. Specifically, the responsivity of CsPbBr3 MCs is found to be as large as 8,990 mA/W, being 13 times larger than the spin-coated films and even better than many state-of-the-art solution-processed AIHPs devices. This device performance enhancement is attributed to the better film quality and phase purity obtained by the drop-casting method. All these results can evidently fill the “technology gap” for further enhancing the material quality of solution-processed AIHPs and breaking down the barriers that hinder the development of AIHPs based optoelectronic devices.


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Electronic supplementary material
About this article

Direct drop-casting synthesis of all-inorganic lead and lead-free halide perovskite microcrystals for high-performance photodetectors

Show Author's information Zhengxun Lai1, You Meng1, Fei Wang1,2,3, Xiuming Bu1, Wei Wang1,3, Pengshan Xie1, Weijun Wang1, Chuntai Liu4, SenPo Yip1,5, Johnny C. Ho1,3,5( )
Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong 999077, China
State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130021, China
State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Kowloon, Hong Kong 999077, China
Key Laboratory of Advanced Materials Processing & Mold (Zhengzhou University), Ministry of Education, Zhengzhou 450002, China
Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka 816–8580, Japan

Abstract

Due to the exciting photoelectric properties, better stability, and environmental-friendly nature, all-inorganic halide perovskites (AIHPs), especially the lead-free perovskites, have attracted worldwide attention. However, the film quality of AIHPs fabricated by typical spin-coating and subsequent high-temperature annealing is still not satisfactory, restricting their further development. Herein, we demonstrate a simple low-temperature solution-processed drop-casting method to achieve highly-crystalline cubic CsPbBr3 and lead-free layer-structured Cs3Sb2I9 microcrystals (MCs). This drop-casting technique not only consumes the less amount of precursor solution but also eliminates the high-temperature annealing as compared with those of spin coating. When these MCs are configured into photodetectors, they exhibit superior device performance, which is in distinct contrast to the one of spin-coated counterparts. Specifically, the responsivity of CsPbBr3 MCs is found to be as large as 8,990 mA/W, being 13 times larger than the spin-coated films and even better than many state-of-the-art solution-processed AIHPs devices. This device performance enhancement is attributed to the better film quality and phase purity obtained by the drop-casting method. All these results can evidently fill the “technology gap” for further enhancing the material quality of solution-processed AIHPs and breaking down the barriers that hinder the development of AIHPs based optoelectronic devices.

Keywords: photodetector, CsPbBr3, drop-casting, Cs3Sb2I9, halide perovskite

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Publication history
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Acknowledgements

Publication history

Received: 28 July 2021
Revised: 15 September 2021
Accepted: 26 September 2021
Published: 10 December 2021
Issue date: April 2022

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021

Acknowledgements

Acknowledgements

We acknowledge the General Research Fund (No. CityU 11306520) and the Theme based Research (No. T42-103/16-N) of the Research Grants Council of Hong Kong, China, and the Foshan Innovative and Entrepreneurial Research Team Program (No. 2018IT100031).

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