Ternary Ta2NiSe5 Flakes for a High‐Performance Infrared Photodetector |
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| Authors: | Liang Li Weike Wang Lin Gan Nan Zhou Xiangde Zhu Qi Zhang Huiqiao Li Mingliang Tian Tianyou Zhai |
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| Affiliation: | 1. State Key Laboratory of Material Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan, P. R. China;2. High Magnetic Field Laboratory, Chinese Academy of Science, Hefei, P. R. China |
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| Abstract: | Multielemental systems enable the use of multiple degrees of freedom for control of physical properties by means of stoichiometric variation. This has attracted extremely high interest in the field of 2D optoelectronics in recent years. Here, for the first time, multilayer 2D ternary Ta2NiSe5 flakes are successfully fabricated using a mechanical exfoliation method from chemical vapor transport synthesized high quality bulk and the optoelectronic properties are systematically investigated. Importantly, a high responsivity of 17.21 A W?1 and high external quantum efficiency of 2645% are recorded from an as‐fabricated photodetector at room temperature in air; this is superior to most other 2D materials‐based photodetectors that have been reported. More intriguingly, a usual sublinear and an unusual superlinear light‐intensity‐dependent photocurrent are observed under air and vacuum, respectively. These excellent and special properties make multilayer ternary Ta2NiSe5 a highly competitive candidate for future infrared optoelectronic applications and an interesting platform for photophysics studies. |
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| Keywords: | 2D materials optoelectronics photodetectors superlinear response Ta2NiSe5 |
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