Site-specific electrical contacts with the two-dimensional materials

Lok-Wing Wong, Lingli Huang, Fangyuan Zheng, Quoc Huy Thi, Jiong Zhao (), Qingming Deng () and Thuc Hue Ly ()
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Lok-Wing Wong: The Hong Kong Polytechnic University
Lingli Huang: City University of Hong Kong
Fangyuan Zheng: The Hong Kong Polytechnic University
Quoc Huy Thi: City University of Hong Kong
Jiong Zhao: The Hong Kong Polytechnic University
Qingming Deng: Huaiyin Normal University
Thuc Hue Ly: City University of Hong Kong

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Electrical contact is an essential issue for all devices. Although the contacts of the emergent two-dimensional materials have been extensively investigated, it is still challenging to produce excellent contacts. The face and edge type contacts have been applied previously, however a comparative study on the site-specific contact performances is lacking. Here we report an in situ transmission electron microscopy study on the contact properties with a series of 2D materials. By manipulating the contact configurations in real time, it is confirmed that, for 2D semiconductors the vdW type face contacts exhibit superior conductivity compared with the non-vdW type contacts. The direct quantum tunneling across the vdW bonded interfaces are virtually more favorable than the Fowler–Nordheim tunneling across chemically bonded interfaces for contacts. Meanwhile, remarkable area, thickness, geometry, and defect site dependences are revealed. Our work sheds light on the significance of contact engineering for 2D materials in future applications.

Date: 2020
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DOI: 10.1038/s41467-020-17784-3

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