Patent ID: 7666782

Claim:
A wire structure, comprising: a first insulating layer comprising a lower layer trench formed in an outer surface thereof; a first diffusion preventing film formed on an inner surface of the lower layer trench; a lower layer wire filled in the lower layer trench over the first diffusion preventing film, wherein said lower layer wire comprises metal; an interlayer diffusion preventing film formed on the lower layer wire, the interlayer diffusion preventing film comprising a high melt point metal or a high melt point metal compound; a second insulating layer formed over the first insulating layer and the interlayer diffusion preventing film, the second insulating layer comprising a via hole that penetrates through the second insulating layer and the interlayer diffusion preventing film so as to reach the lower layer wire; a conductive second diffusion preventing film formed on an inner surface of the via hole; a conductor filled in the via hole over the second diffusion preventing film, and an adhering film, wherein the adhering film comprises material removed from the interlayer diffusion preventing film as a result of etching the interlayer diffusion preventing film to expose the lower layer wire, wherein the adhering film extends from an upper surface of the lower layer wire to a side surface of the second insulating layer within the via hole to an extent such that, in the event metal is removed from said lower layer wire as a result of said etching, said metal adheres to said adhering film and is inhibited from adhering to said second insulating layer.