Patent ID: 8836122

Claim:
A semiconductor device comprising: a semiconductor substrate; a plurality of interlevel insulating films laminated above the semiconductor substrate, including a first and a second interlevel insulating films adjacent to each other; a first wiring trench formed in the first interlevel insulating film; a first damascene wiring including: a first barrier metal film having a diffusion preventive function, formed covering inner surface of the first wiring trench and defining a first main wiring trench; and a first main wiring layer filling the first main wiring trench, formed of first metal element, and added with second metal element having migration suppressing function; a doping recess formed in the first interlevel insulating film near said first wiring trench, and having an in-plane size larger than an in-plane width of said first wiring trench in plane of the first interlevel insulating film; and a doping damascene structure including a doping region barrier metal film of a same material as a material of said first barrier metal film, formed covering inner surface of said doping recess, and defining a doping region recess and a doping metal region filling said doping region recess, and having a higher doping concentration of the second metal element than a doping concentration of the second metal element in said first main wiring layer, wherein said doping damascene structure has no circuit function, and constitutes the impurity source region, and a doping concentration of the second metal element in said first main wiring layer lowers with a distance from said doping metal region.