Patent ID: 7969010
Filing Date: 2011-06-28
Classification: H01L

Abstract:
1. A semiconductor device having an interconnect structure, comprising: a semiconductor substrate; a first interconnect made of a copper-containing metal which is formed over said semiconductor substrate; a conductive plug formed over said first interconnect and connected to said first interconnect; a copper silicide first cap metal film over said first interconnect in an area other than the area where said plug is formed, said first cap metal not being formed over an area of said first interconnect where said plug is formed so as to form shoulders of the first interconnect; a copper silicide plug protecting film formed over said conductive plug; a second interconnect formed over said conductive plug, a lower surface of said second interconnect having a first area and a second area, said plug protecting film being formed under said first area of the lower surface of said second interconnect, said plug protecting film being not formed under said second area of the lower surface of said second interconnect, said second area extending outside said first area to form overhangs, said second interconnect being connected to said conductive plug via said plug protecting film; and an insulating film formed over an area from a side surface of said first interconnect to a side surface of said plug and covering the side surface of said first interconnect, an upper portion of said first interconnect and the side surface of said plug.