Patent ID: 7001839
Filing Date: 2006-02-21
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising the steps of: depositing a first insulation film on a semiconductor substrate; depositing a second insulation film on the first insulation film; forming in the second insulation film an opening portion; depositing a third insulation film on the second insulation film and on portions of the first insulation film exposed by the opening portion; and etching the third insulation film and the first insulation film to form a wire groove on the third insulation film while the second insulation film is hardly etched, and to form a contact hole in the first insulation film with a substantial taper angle at a portion of a side wall of the contact hole while an edge portion of the opening portion exposed during the etching process is gradually removed, using an anisotropic selective etching technique having a slightly lower etching selectivity.