Tellurene Photodetector with High Gain and Wide Bandwidth.
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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 cm2/Vs 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 m, and 3.39 m light wavelength, respectively. Because of the photogating effect, high gains up to 1.9 103 and 3.15 104 are obtained at 520 nm and 3.39 m wavelength, respectively. At the communication wavelength of 1.55 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.
author list (cited authors)
Shen, C., Liu, Y., Wu, J., Xu, C., Cui, D., Li, Z., ... Zhou, C.
complete list of authors
Shen, Chenfei||Liu, Yihang||Wu, Jiangbin||Xu, Chi||Cui, Dingzhou||Li, Zhen||Liu, Qingzhou||Li, Yuanrui||Wang, Yixiu||Cao, Xuan||Kumazoe, Hiroyuki||Shimojo, Fuyuki||Krishnamoorthy, Aravind||Kalia, Rajiv K||Nakano, Aiichiro||Vashishta, Priya D||Amer, Mor R||Abbas, Ahmad N||Wang, Han||Wu, Wenzhuo||Zhou, Chongwu