期刊
ACS NANO
卷 16, 期 5, 页码 8440-8448出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c02986
关键词
ultrathin InSe; photoelectrochemical photodetector; electrochemical intercalation; self-powered; 2D materials
类别
资金
- National Natural Science Foundation of China (NSFC) [51802038]
- China Postdoctoral Science Foundation [2019T120246, 2018M630329]
- Heilongjiang Natural Science Foundation [YQ2020E003]
This study demonstrates high-performance self-powered photoelectrochemical (PEC) photodetectors based on ultrathin InSe nanosheets. The electrical properties and photoresponse of the photodetectors are improved by annealing treatment. The self-powered PEC photodetectors show broadband photoresponse, high responsivity, fast response speed, and good stability under UV-NIR irradiation. The photoresponse can be effectively tuned by the concentration and kind of electrolyte.
Two-dimensional (2D) InSe is a good candidate for high-performance photodetectors due to its good light absorption and electrical transport properties. However, 2D InSe photodetectors usually endure a large driving voltage, and 2D InSe-based heterojunction photodetectors require complex fabrication processes. Here, we demonstrate high-performance self-powered InSe-based photoelectrochemical (PEC) photodetectors using electrochemical intercalated ultrathin InSe nanosheets. The ultrathin InSe nanosheets have good crystallinity with a uniform thickness of 1.4-2.1 nm, lateral size up to 18 ism, and yield of 82%. The self-powered InSe-based PEC photodetectors show broadband photoresponse ranging from 365 to 850 nm. The photoresponse of InSe-based PEC photodetectors is boosted by suppressing p-type doping of the intercalator with annealing, which improves the electrical properties and facilitates electron transport from InSe to the electrode. The self-powered annealed InSe (A-InSe) PEC photodetectors show a high responsivity of 10.14 mA/W and fast response speed of 2/37 ms. Moreover, the self-powered PEC photodetectors have good stability under UV-NIR irradiation. Furthermore, the photoresponse can be effectively tuned by the concentration and kind of electrolyte. The facile large-scale fabrication and good photoresponse demonstrate that 2D ultrathin InSe can be applied in high-performance optoelectronic devices.
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