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

Claim 4:
5. The SiC ohmic contact preparation method according to claim 1, wherein the forming an Au electrode and then annealing comprises:
stripping off the second transfer electrode pattern to form the Au electrode, and process conditions of the stripping off sequentially including: soaking a composite structure with the Au material, the Au film and the graphene/SiC structure in acetone for 12 h, sucking up a cocked Au metal by a disposable burette, taking out the soaked composite structure, cleaning with acetone ethanol, and drying by a nitrogen gas gun; and
carrying out the annealing, and process conditions of the annealing sequentially including: before the annealing, vacuuming to 4 mbar, introducing nitrogen gas, then vacuuming to 4 mbar again, and continuing to introduce nitrogen gas of which a flow rate is 2000 standard cubic centimeter per minute (sccm); heating up to 400° C. and maintaining for 10 seconds (s); heating up to 600° C. at 10° C./s and maintaining for 30 minutes (min); and cooling with cooling water for 420 s.