Patent ID: 7622774

Claim:
A semiconductor device including an n-type MOSFET structure comprising: a silicon substrate having a device isolation region; diffusion regions formed in the silicon substrate; gate electrodes formed above the silicon substrate; and a NiSi region containing F without incorporation of dopant impurities and disposed on the gate electrode; and a F-containing NiSi layer formed on the diffusion regions and containing F atoms at a concentration of 3.0×10 13 cm −2 or more in areal density, a depth from the junction position formed between the diffusion region and the silicon substrate to the bottom of the F-containing NiSi layer being in the range of 20 to 100 nm; and the concentration of F atoms at an interface between the F-containing NiSi layer and the silicon substrate being 8.0×10 18 cm −3 or more.