Patent ID: 7141840

Claim:
A semiconductor device comprising: a silicon substrate; a region having impurities of an element belonging to the group III formed on one main surface of the semiconductor substrate; a gate dielectric film formed in the region; a gate electrode formed by being stacked on the gate dielectric film; and a source or a drain containing impurities of an element belonging to the group V element corresponding to the gate electrode; wherein: the source or the drain has a first element comprising phosphorus and a second element comprising arsenic or antimony; a depth from the surface of the silicon substrate where a concentration of the first element is highest is less than a depth from the surface of the silicon substrate where a concentration of the second element is highest; and a concentration of the element in the region where the concentrations of the first element and the second element are highest is from 10 26 atoms/m 3 or more and 10 27 atoms/m 3 or less.