Patent ID: 7834404

Claim:
A semiconductor device, comprising: a first impurity region formed in a first portion of a main surface of a semiconductor substrate; a second impurity region formed in a second portion of the main surface of said semiconductor substrate; a first nickel silicide film formed on the first portion of the main surface of said semiconductor substrate, said first impurity region being located in the first portion; a second nickel silicide film formed on the second portion of the main surface of said semiconductor substrate, said second impurity region being located in the second portion, a first conducting film formed on said first nickel silicide film, and a second conducting film formed on said second nickel silicide film, wherein a difference between a thickness of said first nickel silicide film under a first contact portion between said first conducting film and said first nickel silicide film, and a thickness of said first nickel silicide film on a periphery of said first contact portion is set to be at most 10 nm, and a difference between a thickness of said second nickel silicide film under a second contact portion between said second conducting film and said second nickel silicide film, and a thickness of said second nickel silicide film on a periphery of said second contact portion is set to be at most 10 nm wherein a difference between a thickness of said first nickel silicide film and a thickness of said second nickel silicide film is set to be at most 10 nm.