Patent ID: 9601332
Date: 2017-03-21
CPC Classifications: H01L

Claim:
1. A silicon carbide device, comprising a gate electrode disposed over a portion of a silicon carbide substrate; a dielectric film disposed over the gate electrode; a contact region of the silicon carbide device disposed near the gate electrode, the contact region including a base of a well of the silicon carbide substrate, the base of the well being doped with a first conductivity type, and two regions on opposite sides of the base of the well, the two regions being doped with a second conductivity type opposite the first conductivity type; and a plurality of layers disposed over the contact region of the silicon carbide device, wherein the plurality of layers are configured to provide an ohmic contact to the contact region of the silicon carbide device, wherein the plurality of layers extend over an entirety of an upper surface of the base of the well and directly contacts the upper surface of the base of the well and across at least portions of each of the two regions on opposites sides of the base of the well, wherein the plurality of layers comprise a titanium/aluminum layer disposed on a first portion of the base of the well of the contact region of the silicon carbide device; and wherein the plurality of layers further comprise nickel silicide layers disposed on portions of the two regions and directly contacting an upper surface of a second portion of the base of the well of the contact region of the silicon carbide device.