Patent ID: 7915686

Claim:
A semiconductor device comprising: a semiconductor substrate; a first MISFET of an n channel type formed on said semiconductor substrate; and a second MISFET of a p channel type formed on said semiconductor substrate; wherein a gate insulating film of each of said first and second MISFETs consists essentially of a silicon oxide film or a silicon oxynitride film, a gate electrode of each of said first and second MISFETs includes a conductive silicon film positioned on said gate insulating film, monatomic metal elements are introduced near an interface between said gate electrode and said gate insulating film in each of said first and second MISFETs such that metal atoms with a surface density of 1×10 13 to 5×10 14 atoms/cm 2 are contained in a region within 0.5 nm upward and downward from the interface and metal atoms are not contained in a region of the gate insulating film and the gate electrode separated by more than 0.5 nm from the interface, respectively, and a channel region of each of said first and second MISFETs contains an impurity the concentration of which is equal to or lower than 1.2×10 18 /cm 3 .