Patent ID: 6653739
Filing Date: 2003-11-25
Classification: H01L,Y10S

Abstract:
A semiconductor device having a contact hole defined between adjacent two wirings by a self-aligning manner, comprising:a contact plug formed in said contact hole; a substrate layer conductive to the bottom face of said contact plug; an interlayer oxide film formed on said substrate layer; a lower insulating film formed of a nitride based insulating film so as to cover the entire surface of said interlayer oxide film except for said contact hole portion; said two wirings formed on said lower insulating film with said contact hole interposed therebetween; an upper insulating film formed of a nitride based insulating film with the same width as said each wiring so as to cover the upper surface of said each wiring; and sidewalls formed of a nitride based insulating film so as to cover the side faces of said each wiring and the side faces of said upper insulating film, wherein said contact hole has an enlarged portion formed in the same layer as said interlayer oxide film, which has a diameter larger than an interval defined between said two wirings.