摘要
Black phosphorus（BP） is a promising material for ultrafast and broadband photodetection because of its narrow bandgap from 0.35 eV（bulk） to 1.8 eV（monolayer） and high carrier mobility. Although photodetectors based on BP with different configurations have been reported, high photosensitivity was mostly observed in the visible range. A highly efficient BP-based infrared photodetector operated in the telecom spectral range, especially at 1550 nm, has not been demonstrated. Here, we report a Schottky-type photodetector based on thin BP flakes,operating in a broad spectral range from visible（635 nm） to infrared（1550 nm）. A responsivity as high as 230 A·W^（-1） was achieved at 1550 nm with a source-drain bias of 1 V. The rise time is 4.8 ms, and the fall time is 6.8 ms. Under light illumination and external bias, the Schottky barrier between the BP and metal was reduced, leading to efficient photocurrent extraction. The unprecedented performance of the BP photodetector indicates intriguing potential for sensing, imaging, and optical communication.
Black phosphorus（BP） is a promising material for ultrafast and broadband photodetection because of its narrow bandgap from 0.35 eV（bulk） to 1.8 eV（monolayer） and high carrier mobility. Although photodetectors based on BP with different configurations have been reported, high photosensitivity was mostly observed in the visible range. A highly efficient BP-based infrared photodetector operated in the telecom spectral range, especially at 1550 nm, has not been demonstrated. Here, we report a Schottky-type photodetector based on thin BP flakes,operating in a broad spectral range from visible（635 nm） to infrared（1550 nm）. A responsivity as high as 230 A·W^（-1） was achieved at 1550 nm with a source-drain bias of 1 V. The rise time is 4.8 ms, and the fall time is 6.8 ms. Under light illumination and external bias, the Schottky barrier between the BP and metal was reduced, leading to efficient photocurrent extraction. The unprecedented performance of the BP photodetector indicates intriguing potential for sensing, imaging, and optical communication.
作者
刘岩
孙甜
马玮良
于文治
Shivananju B.Nanjunda
李绍娟
鲍桥梁
Yan Liu 1, Tian Sun 1, Weiliang Ma 1, Wenzhi Yu 1, Shivananju B. Nanjunda1, Shaojuan Li1, and Qiaoliang Bao 1,2(1Institute of Functional Nano and Soft Materials （FUNSOM）, Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, China 2Department of Materials Science and Engineering, Monash University, Clayton 3800, Australia)
基金
supported by the Youth 973 Program(No.2015CB932700)
the National Key Research&Development Program(No.2016YFA0201902)
the National Natural Science Foundation of China(Nos.61604102,51290273,91433107,and 11404372)
the ARC(Nos.DP140101501,FT150100450,and CE170100039)
the China Postdoctoral Science Foundation(Nos.2014M550303 and 2014M551654)
the Natural Science Foundation of Jiangsu Province(No.BK20130328)
the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
the Collaborative Innovation Center of Suzhou Nano Science and Technology
