Patent ID: 9666482
Date: 2017-05-30
CPC Classifications: H01L

Claim:
1. A method of forming a contact structure for a semiconductor device, comprising: providing a silicon-carbide substrate that comprises: a doped silicon-carbide contact region directly adjoining a main surface of the substrate, and a dielectric layer covering the main surface; forming a protective layer on the dielectric layer; forming a structured mask on the protective layer, the structured mask comprising openings that are aligned with the doped silicon-carbide contact region; removing sections of the protective layer and the dielectric layer that are exposed by the openings without removing remaining sections of the protective layer and the dielectric layer that are disposed underneath the mask; removing the structured mask; depositing a metal layer such that a first portion of the metal layer directly contacts the doped silicon-carbide contact region and a second portion of the metal layer lines the remaining sections of the protective layer and the dielectric layer; performing a first rapid thermal anneal process; and after performing the first rapid thermal anneal process, removing the second portion of the metal layer and the remaining section of the protective layer without removing the first portion of the metal layer.