Patent ID: 8809142

Claim:
A method of forming an e-fuse structure comprising: patterning a conductor on a substrate to form an anode, a fuse link, and a cathode in said conductor, a first end of said fuse link being connected to said anode, and a second end of said fuse link opposite said first end being connected to said cathode, said fuse link comprising a first fuse link region and a second fuse link region, said first fuse link region comprising a portion of said fuse link being adjacent said anode, a second fuse link region comprising a portion of said fuse link being adjacent said cathode, and said first fuse link region comprising more than half of said fuse link; forming an impurity in said second fuse link region, adjacent said cathode, such that said impurity is formed closer to said cathode than to said anode; and siliciding said fuse link to form a silicide layer on said fuse link, said silicide layer on said second fuse link region being formed thinner than said silicide layer on said first fuse link region.