Patent ID: 8008777

Claim:
A semiconductor device, comprising: a first electrically conductive pattern; a first interlayer dielectric positioned over the first electrically conductive pattern; an etching stopper film comprising at least two films each comprising nitrogen and constituent materials identical in quality to each other, respectively, deposited on one another, and positioned on top of the first interlayer dielectric; a second interlayer dielectric positioned over the etching stopper film; an interconnect groove formed in the second interlayer dielectric, and positioned above the first electrically conductive pattern, a portion of the etching stopper film being exposed to a bottom of the interconnect groove; a connection hole formed in the first interlayer dielectric and the etching stopper film to connect an underside of the interconnect groove to the first electrically conductive pattern; and a second electrically conductive pattern embedded in the connection hole and the interconnect groove.