Patent ID: 11948983
Assignee: XIDIAN UNIVERSITY
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A silicon carbide (SiC) ohmic contact preparation method, comprising:
selecting a SiC substrate;
forming a graphene/SiC composite structure by epitaxially growing a graphene on a Si-face of the SiC substrate;
depositing an Au film on the graphene of the graphene/SiC composite structure;
forming a Ni electrode by sputtering a Ni metal on a C-face of the SiC substrate;
forming a first transfer electrode pattern on the Au film by a first photolithography;
etching the Au film uncovered by the first transfer electrode pattern by a wet etching;
etching the graphene uncovered by the Au film by a plasma etching;
forming a second transfer electrode pattern on the Au film by a second photolithography;
etching the Au film uncovered by the second transfer electrode pattern through a wet etching;
forming a third transfer electrode pattern on the SiC substrate and the graphene by a third photolithography; and
depositing an Au material on the graphene and the SiC substrate to form an Au electrode and then annealing, so as to obtain a SiC ohmic contact.