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Anisotropic Broadband Photoresponse of Layered Type‐II Weyl Semimetal MoTe 2
Author(s) -
Lai Jiawei,
Liu Xin,
Ma Junchao,
Wang Qinsheng,
Zhang Kenan,
Ren Xiao,
Liu Yinan,
Gu Qiangqiang,
Zhuo Xiao,
Lu Wei,
Wu Yang,
Li Yuan,
Feng Ji,
Zhou Shuyun,
Chen JianHao,
Sun Dong
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201707152
Subject(s) - weyl semimetal , photodetector , materials science , anisotropy , responsivity , optoelectronics , semimetal , optics , physics , silicon
Photodetectors based on Weyl semimetal promise extreme performance in terms of highly sensitive, broadband and self‐powered operation owing to its extraordinary material properties. Layered Type‐II Weyl semimetal that break Lorentz invariance can be further integrated with other two‐dimensional materials to form van der Waals heterostructures and realize multiple functionalities inheriting the advantages of other two‐dimensional materials. Herein, we report the realization of a broadband self‐powered photodetector based on Type‐II Weyl semimetal T d ‐MoTe 2 . The prototype metal–MoTe 2 –metal photodetector exhibits a responsivity of 0.40 mA W −1 and specific directivity of 1.07 × 10 8 Jones with 43 μs response time at 532 nm. Broadband responses from 532 nm to 10.6 μm are experimentally tested with a potential detection range extendable to far‐infrared and terahertz. Furthermore, we identify the response of the detector is polarization angle sensitive due to the anisotropic response of MoTe 2 . The anisotropy is found to be wavelength dependent, and the degree of anisotropy increases as the excitation wavelength gets closer to the Weyl nodes. In addition, with power and temperature dependent photoresponse measurements, the photocurrent generation mechanisms are investigated. Our results suggest this emerging class of materials can be harnessed for broadband angle sensitive, self‐powered photodetection with decent responsivities.