Patent ID: 7223664

Claim:
A method for fabricating a semiconductor device comprising the steps of: forming a gate electrode over a semiconductor substrate with a gate insulation film formed therebetween; implanting a dopant impurity into the semiconductor substrate with the gate electrode as a mask to form a first impurity diffused region in the semiconductor substrate on both sides of the gate electrode; depositing a first insulation film over the semiconductor substrate and anisotropically etching the first insulation film to form the first insulation film on a side wall of the gate electrode; implanting a dopant impurity into the semiconductor substrate with the gate electrode and the first insulation film as a mask to form a second impurity diffused region in the semiconductor substrate on both sides of the gate electrode; partially removing the first insulation film, leaving the first insulation film in a skirt-like form at a lower part of the side wall of the gate electrode, the first insulation film covering an end of the first impurity diffused region nearer to the gate electrode; and depositing a second insulation film over the semiconductor substrate and anisotropically etching the second insulation film to form the second insulation film on an exposed part of the side wall of the gate electrode, which is not covered by the first insulation film and on a side surface of the first insulation film.