Patent ID: 7098110

Claim:
A method of manufacturing a semiconductor device comprising the steps of: forming, on a semiconductor substrate having a first conductivity type, a gate insulating film which comprises a material having a dielectric constant higher than that of a silicon oxide film; forming a gate electrode on said gate insulating film; introducing nitrogen into the surfaces of said semiconductor substrate and said gate electrode, thereby forming a silicon nitride layer; and forming a pair of impurity layers through said silicon nitride layer, said impurity layers having the opposite conductivity type from said first conductivity type, which are formed in said semiconductor substrate to fall on both sides of the gate electrode further comprising a step, which comes next to said step for introducing nitrogen, for forming side walls on the side surfaces of said gate electrode while placing a nitrogen-containing layer formed in said step for introducing nitrogen in between; wherein said sidewalls are etched to form a notch along the side of said gate electrode.