Tellurene Photodetector with High Gain and Wide Bandwidth

• Published in: ACS nano 2020-01, Vol.14 (1), p.303-310
• Main 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
• Format: Article
• Language: English
• ISSN: 1936-0851; 1936-086X
• DOI: 10.1021/acsnano.9b04507

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/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 μm, and 3.39 μm 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 μm wavelength, respectively. At the communication wavelength of 1.55 μm, 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.