Patent ID: 7696625

Claim:
A semiconductor device comprising: a wiring layer; and a porous insulating film having a wiring trench and a contact hole connected to said wiring trench, wherein the wiring layer comprises: a first conductive layer in contact with a bottom and an inner wall of each of the wiring trench and the contact hole formed in the porous insulating film, a second conductive layer on the first conductive layer, and a third conductive layer in contact with the first conductive layer and a top surface of the second conductive layer, wherein a first surface including a top surface of the porous insulating film and a second surface including a top surface of the third conductive layer have a stepped portion therebetween, and wherein the first surface including the top surface of the porous insulating film and a third surface including the top surface of the second conductive layer have a stepped portion therebetween.