Lead‐Free Perovskite Derivative Cs2SnCl6−xBrx Single Crystals for Narrowband Photodetectors

Advanced Optical Materials - Tập 7 Số 10 - 2019
Jun Zhou1, Jiajun Luo2, Ximing Rong3,4, Peijia Wei1, Maxim S. Мolokeev5,6,7, Yang Huang3,4, Jing Zhao1, Quanlin Liu1, Xiuwen Zhang4, Jiang Tang2, Zhiguo Xia8,1
1The Beijing Municipal Key Laboratory of New Energy Materials and Technologies School of Materials Sciences and Engineering University of Science and Technology Beijing Beijing 100083 P. R. China
2Sargent Joint Research Center Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information Huazhong University of Science and Technology (HUST) Wuhan 430074 P. R. China
3Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, P.R. China
4Shenzhen Key Laboratory of Flexible Memory Materials and Devices College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 P. R. China
5Department of Engineering Physics and Radioelectronics Siberian Federal University Krasnoyarsk 660041 Russia
6Department of Physics, Far Eastern State Transport University, Khabarovsk 680021, Russia
7Laboratory of Crystal Physics, Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
8State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials South China University of Technology Guangzhou 510641 P. R. China

Tóm tắt

AbstractLead‐free and stable Sn halide perovskites demonstrate tremendous potential in the field of optoelectronic devices. Here, the structure and optical properties of the “defect” perovskites Cs2SnCl6−xBrx are reported, as well as their use as photodetector materials. Millimeter‐sized Cs2SnCl6−xBrx single crystals are grown by the hydrothermal method, with the body color continuously changing from transparent to yellow and finally to dark red. Narrowband single‐crystal photodetectors using Cs2SnCl6−xBrx crystals are presented, which show a high detectivity of ≈2.71 × 1010 Jones, with narrowband photodetection (full‐width at half‐maximum ≈45 nm) and high ion diffusion barriers. Moreover, the response spectra are continuously tuned from near violet to orange depending on the variation of the bandgap of the single crystals by changing the halide compositions. The strong surface charge recombination of the excess carriers near the crystal surfaces produced by short wavelength light elucidates the narrowband photodetection behavior. This work provides a new paradigm in the design of lead‐free, stable, and high‐performance perovskite derivatives for optoelectronics applications.

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