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Realization of robust Ohmic contact for semiconducting black arsenic by coupling with graphene |
| Xinjuan Cheng(程新娟) and Xuechao Zhai(翟学超)† |
| Department of Applied Physics, and MIIT Key Laboratory of Semiconductor Microstructures and Quantum Sensing, Nanjing University of Science and Technology, Nanjing 210094, China |
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Abstract Ohmic contacts are fundamental components in semiconductor technology, facilitating efficient electrical connection and excellent device performance. We employ first-principles calculations to show that semimetallic graphene is a natural Ohmic contact partner of monolayer semiconducting black arsenic (BAs), for which the top of the valence band is below the Fermi energy of the order of 10$^2$ meV. The Ohmic contact arises from the giant Stark effect induced by van der Waals electron transfer from BAs to graphene, which does not destroy their respective band features. Remarkably, we show that this intrinsic Ohmic contact remains robust across a wide range of interlayer distances (adjustable by strain) or vertical electric fields, whereas the weak spin splitting of the order of 1 meV induced by symmetry breaking plays little part in Ohmic contact. These findings reveal the potential applications of graphene-BAs in ultralow dissipation transistors.
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Received: 31 October 2024
Revised: 06 December 2024
Accepted manuscript online: 18 December 2024
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PACS:
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74.78.Fk
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(Multilayers, superlattices, heterostructures)
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61.82.Fk
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(Semiconductors)
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32.60.+i
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(Zeeman and Stark effects)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 62374088 and 12074193). |
Corresponding Authors:
Xuechao Zhai
E-mail: zhaixuechao@njust.edu.cn
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Cite this article:
Xinjuan Cheng(程新娟) and Xuechao Zhai(翟学超)† Realization of robust Ohmic contact for semiconducting black arsenic by coupling with graphene 2025 Chin. Phys. B 34 027402
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