Patent ID: 6693343
Filing Date: 2004-02-17
Classification: H01L

Abstract:
In an integrated circuit structure, the improvement comprising a self-passivating Cu-laser fuse characterized by resistance to oxidation and corrosion and improved adhesion in the interface between Cu and metallization lines and Cu and a dielectric cap, subsequent to blowing the fuse by an energizing laser, said fuse comprising:a) a metallization-line; b) a liner separating said metallization line and a combination Cu-alloy seed layer and pure Cu layer; c) a dielectric surrounding said liner; and d) a dielectric cap disposed over said surrounding dielectric, said liner and said combination Cu-alloy seed layer and pure Cu layer; and e) a passivation layer of oxide, nitride or combinations of nitrides deposited on said cap layer that has been annealed at a temperature of from about 250Â° C. to about 450Â° C.; said laser fuse being characterized after laser energizing by passivation areas; f) on the open Cu-fuse surface; and g) in the interfaces between: (i) said Cu-alloy seed layer and said liners and dielectric; and (ii) between said pure Cu layer and said dielectric cap.