Patent ID: 9704743
Date: 2017-07-11
CPC Classifications: H01L

Claim:
1. A method for manufacturing a silicon carbide semiconductor device comprising steps of: forming an insulating layer on a substrate having a main surface and made of silicon carbide; forming a mask layer on said insulating layer, said mask layer having an opening; forming a contact hole in said insulating layer to expose a contact region by etching said insulating layer using said mask layer, said contact region being a portion of said main surface of said substrate, the step of forming said contact hole including a step of providing said contact region with a surface roughness Ra of not less than 0.5 nm; forming an electrode layer in contact with said contact region of said substrate; and causing siliciding reaction between said electrode layer and said contact region of said substrate by heating said electrode layer and said substrate, wherein the step of providing said contact region with a surface roughness Ra of not less than 0.5 nm includes a step of making said contact region rough, and wherein the step of making said contact region rough includes steps of: subjecting said contact region to oxygen plasma; and etching said contact region after the step of subjecting said contact region to the oxygen plasma, and the step of etching said contact region is performed under conditions that an etching rate for silicon carbide is larger than an etching rate for silicon oxide.