Patent ID: 9728607
Date: 2017-08-08
CPC Classifications: H01L

Claim:
1. A method for manufacturing a silicon carbide semiconductor device, comprising the steps of: preparing a silicon carbide substrate, said silicon carbide substrate having a first main surface and a second main surface opposite to each other, having a gate insulating film provided in contact with said first main surface, having a gate electrode provided in contact with said gate insulating film, and including a first conductivity type region in contact with said first main surface; forming an interlayer insulating film in contact with said gate electrode and said gate insulating film; forming a mask layer in contact with said interlayer insulating film; forming a first recess having a first inner wall surface formed in said interlayer insulating film by performing a first isotropic etching with respect to said interlayer insulating film with use of said mask layer; after said step of forming a first recess, forming a second recess having a second inner wall surface by performing a first anisotropic etching with respect to said interlayer insulating film and said gate insulating film with use of said mask layer and thereby exposing said first conductivity type region of said silicon carbide substrate from said gate insulating film; forming a first electrode in contact with said first conductivity type region; and forming an interconnection being arranged in contact with said first inner wall surface and said second inner wall surface and electrically connected to said first electrode, wherein the second inner wall surface is formed with the gate insulating film and the interlayer insulating film, wherein the gate insulating film is exposed to the second inner wall surface, and wherein said step of forming an interconnection includes: