Journal
JOURNAL OF APPLIED PHYSICS
Volume 132, Issue 24, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0122722
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Funding
- National Natural Science Foundation of China (NNSFC) [62074071]
- Xuzhou Science and Technology Project [KC21008]
- Qinglan Project of Jiangsu Higher Education Institutions
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This paper investigates the effects of MoS2 intercalation on the interface properties of metal/SiC systems using first-principles calculation. The results show that the insertion of MoS2 significantly reduces the Schottky barrier heights of metal/SiC contacts, resulting in the formation of n-type Ohmic contacts. The formation mechanism of Ohmic contacts may be attributed to the saturation of dangling bonds on the SiC surface, the reduction of metal-induced gap states, the formation of an interface dipole layer, and the shift of Fermi level pinning position to the metal/MoS2 interface.
Due to the difficulty of forming a low Schottky barrier at the interface of a metal/SiC contact, preparing Ohmic contacts is still a key technical problem in developing SiC devices. In this paper, the effects of MoS2 intercalation on the interface properties of metal/SiC (Al, Ag, Ti, Au, and Mg) systems were investigated by first-principles calculation. The calculations show that all the metal/SiC contacts exhibit p-type Schottky contacts with strong Fermi level pinning (FLP) at the interfaces. After inserting a layer of MoS2, the Schottky barrier heights are significantly reduced. All the metal/MoS2/SiC systems are tuned to be n-type Ohmic contacts. By calculating and analyzing electron localization functions, projected band structure, partial density of states, and planar-averaged charge density difference, the Ohmic contact formation mechanism may be due to the saturation of dangling bonds of the SiC surface, the reduction in metal-induced gap states, the formation of interface dipole layer, and the shift of FLP position to the interface of metal/MoS2.
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