Patent ID: 6777738
Filing Date: 2004-08-17
Classification: H01L

Abstract:
A semiconductor integrated circuit having an interconnection structure including conductive plug passing through insulating films on a substrate, said circuit comprising:a first insulating film; a second insulating film provided on said first insulating film; a contact hole provided in such a manner as to pass through said first and second insulating films; a conductive plug provided in said contact hole, said conductive plug having a cavity formed under the bottom surface of said second insulating film; an interconnection layer provided on said second insulating film in such a manner as to be conducted to said conductive plug; and a recess provided at the upper end surface of said conductive plug contained in said contact hole, said recess depressing the upper end surface of said conductive plug to a position lower than the upper surface of said second insulating film; wherein the thickness of said second insulating film is larger than the depth of said recess.