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Crystalline all-inorganic lead-free Cs3Sb2I9 perovskite microplates with ultra-fast photoconductive response and robust thermal stability

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Abstract

Hybrid organolead halide perovskites have attracted tremendous attention due to their recent success as high efficiency solar cell materials and their fascinating material properties uniquely suitable for optoelectronic devices. However, the poor ambient and operational stability as well as the concern of lead toxicity greatly hamper their practical utilization. In this work, crystalline, all-inorganic and lead-free Cs3Sb2I9 perovskite microplates are successfully synthesized by a two-step chemical vapor deposition method. As compared with other typical lead-free perovskite materials, the Cs3Sb2I9 microplates demonstrate excellent optoelectronic properties, including substantial enhancements in the Stokes shift, exciton binding energy and electron-phonon coupling. Simple photoconductive devices fabricated using these microplates exhibit an ultra-fast response with the rise and decay time constants down to 96 and 58 µs, respectively. This respectable photoconductor performance can be regarded as a record among all the lead-free perovskite materials. Importantly, these photodetectors show superior thermal stability in a wide temperature range, capable to function reversibly between 80 and 380 K, indicating their robustness to operate under both low and high temperatures. All these results evidently suggest the technological potential of inorganic lead-free Cs3Sb2I9 perovskite microplates for next-generation high-performance optoelectronic devices.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 11874351, 11874352, 51672229, and 61805237), the Hong Kong Scholars Program (No. XJ2019027), the General Research Fund (CityU 11204618) and the Theme-based Research (No. T42-103/16-N) of the Research Grants Council of Hong Kong SAR, China, CityU SGP-9380076 and the Foshan Innovative and Entrepreneurial Research Team Program (No. 2018IT100031).

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  1. Sujit Kumer Shil and Fei Wang contributed equally to this work.

Authors and Affiliations

  1. Department of Physics, City University of Hong Kong, Kowloon, Hong Kong, China

    Sujit Kumer Shil, Mohammad Kamal Hossain, Kingsley O. Egbo, Ying Wang & Kin Man Yu

  2. Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, China

    Fei Wang, Zhengxun Lai, You Meng & Johnny C. Ho

  3. Department of Physics, Khulna University of Engineering & Technology (KUET), Khulna, 9203, Bangladesh

    Sujit Kumer Shil

  4. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Dongnanhu Road, Changchun, 130021, China

    Fei Wang, Yunpeng Wang & Dongxu Zhao

  5. State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Kowloon, Hong Kong, China

    Fei Wang & Johnny C. Ho

  6. Department of Physics, Comilla University, Kotbari, Comilla, 3506, Bangladesh

    Mohammad Kamal Hossain

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Correspondence to Fei Wang, Kin Man Yu or Johnny C. Ho.

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Crystalline all-inorganic lead-free Cs3Sb2I9 perovskite microplates with ultra-fast photoconductive response and robust thermal stability

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Shil, S.K., Wang, F., Lai, Z. et al. Crystalline all-inorganic lead-free Cs3Sb2I9 perovskite microplates with ultra-fast photoconductive response and robust thermal stability. Nano Res. 14, 4116–4124 (2021). https://doi.org/10.1007/s12274-021-3351-x

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  • DOI: https://doi.org/10.1007/s12274-021-3351-x

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