Research Article

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2021, 14(11): 4116–4124

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

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

Sujit Kumer Shil1,3,§, Fei Wang2,4,5,§ (✉), Zhengxun Lai2, You Meng2, Yunpeng Wang4, Dongxu Zhao4, Mohammad Kamal Hossain1,6, Kingsley O. Egbo1, Ying Wang1, Kin Man Yu1 (✉), and Johnny C. Ho2,5 (✉)

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1 Department of Physics, City University of Hong Kong, Kowloon, Hong Kong, China
2 Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, China
3 Department of Physics, Khulna University of Engineering & Technology (KUET), Khulna 9203, Bangladesh
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
5 State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Kowloon, Hong Kong, China
6 Department of Physics, Comilla University, Kotbari, Comilla 3506, Bangladesh
§ Sujit Kumer Shil and Fei Wang contributed equally to this work.

Keywords: all-inorganic, lead-free perovskites, Cs3Sb2I9, microplates, photoresponse, stability
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  • Abstract
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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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Crystalline all-inorganic lead-free Cs3Sb2I9 perovskite microplates with ultra-fast photoconductive response and robust thermal stability. Nano Res. 2021, 14(11): 4116–4124 https://doi.org/10.1007/s12274-021-3351-x

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