Patent ID: 9240451
Filing Date: 2016-01-19
CPC Classification: H01L

Claim Text:
1. A silicon carbide semiconductor device, comprising: a silicon carbide semiconductor substrate including: a first region that has a structure in which a first-conductivity-type region is provided or a structure in which the first-conductivity-type region and a second-conductivity-type region are periodically provided; a second region which surrounds the first region and in which a second-conductivity-type region is provided; a third region which surrounds the second region and in which a second-conductivity-type region having a different impurity concentration from the second-conductivity-type region of the second region is provided; and an interlayer insulating film which is formed on the second region and the third region; a first metal layer that covers at least the first region and that is a film including at least one of a titanium film, a titanium alloy film, a nickel film, a nickel alloy film, or a nickel-titanium alloy film; and a second metal layer that is formed on the first metal layer and that is an aluminum film or an aluminum alloy film, wherein the first and second metal layers are formed on the silicon carbide semiconductor substrate, and wherein dry etching is performed on a portion of the second metal layer and the second metal layer covers the entire first metal layer.