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Nano Research

Article Title

Highly stable lead-free Cs3Bi2I9 perovskite nanoplates for photodetection applications

Authors

Zhaoyang Qi, Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials and Engineering, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
Xianwei Fu, Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials and Engineering, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
Tiefeng Yang, Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials and Engineering, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
Dong Li, Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials and Engineering, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
Peng Fan, Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials and Engineering, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
Honglai Li, Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials and Engineering, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
Feng Jiang, Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials and Engineering, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
Lihui Li, Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials and Engineering, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
Ziyu Luo, Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials and Engineering, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
Xiujuan Zhuang, Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials and Engineering, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
Anlian Pan, Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials and Engineering, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China

Keywords

bismuth, inorganic perovskite, lead-free, highly stable, nanoplates, photodetector

Abstract

Lead halide perovskites have received tremendous attentions recently for their excellent properties such as high light absorption coefficient and long charge carrier diffusion length. However, the stability issues and the existence of toxic lead cations have largely limited their applications in optoelectronic area. Herein, we report the synthesis and investigation of highly stable and lead-free Cs3Bi2I9 perovskite nanoplates for visible light photodetection applications. The Cs3Bi2I9 nanoplates were synthesized through a facile solution-processed method, which is also applicable to various substrates. The achieved nanoplates present very good crystal quality and exhibit excellent long-term stability even exposed in moist air for several months. Photodetectors were constructed based on these high-quality perovskite nanoplates for the first time, and display a maximum photoresponsivity of 33.1 mA/W under the illumination of 450 nm laser, which is six times higher than the solution-synthesized CH3NH3PbI3 nanowire photodetectors. The specific detectivity of these devices can reach up to 1010 Jones. Additionally, the devices exhibit fast rise and decay time of 10.2 and 37.2 ms, respectively, and highly stable photoswitching behavior with their photoresponse well retaining under alternating light and darkness. This work opens up a new opportunity for stable and low-toxic perovskite-based optoelectronic applications.

Graphical Abstract

Publisher

Tsinghua University Press

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