期刊
ACS NANO
卷 14, 期 1, 页码 303-310出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b04507
关键词
photodetector; two-dimensional (2D); tellurene; high gain; wide bandwidth; air-stable
类别
资金
- University of Southern California
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0014607]
- National Science Foundation [CMMI-1762698]
Two-dimensional (2D) semiconductors have been extensively explored as a new class of materials with great potential. In particular, black phosphorus (BP) has been considered to be a strong candidate for applications such as high-performance infrared photodetectors. However, the scalability of BP thin film is still a challenge, and its poor stability in the air has hampered the progress of the commercialization of BP devices. Herein, we report the use of hydrothermal-synthesized and air-stable 2D tellurene nanoflakes for broadband and ultrasensitive photodetection. The tellurene nanoflakes show high hole mobilities up to 458 cm(2)/V.s at ambient conditions, and the tellurene photodetector presents peak extrinsic responsivity of 383 A/W, 19.2 mA/W, and 18.9 mA/W at 520 nm, 1.55 mu m, and 3.39 mu m light wavelength, respectively. Because of the photogating effect, high gains up to 1.9 x 10(3) and 3.15 x 10(4) are obtained at 520 nm and 3.39 mu m wavelength, respectively. At the communication wavelength of 1.55 mu m, the tellurene photodetector exhibits an exceptionally high anisotropic behavior, and a large bandwidth of 37 MHz is obtained. The photodetection performance at different wavelength is further supported by the corresponding quantum molecular dynamics (QMD) simulations. Our approach has demonstrated the air-stable tellurene photodetectors that fully cover the short-wave infrared band with ultrafast photoresponse.
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