Patent ID: 7579246

Claim:
A method of manufacturing a semiconductor device comprising steps of: (a) forming an isolation insulating film in a surface layer of a semiconductor substrate to form a first active region of a first conductivity type and an opposite conductivity type active region of a second conductivity type, the first active region and the opposite conductivity type active region being adjacent to each other across the isolation insulating film; (b) covering the opposite conductivity type active region with a first resist pattern, with an edge of the first resist pattern being disposed on the isolation insulating film between the first active region and the opposite conductivity type active region; and (c) implanting impurity ions using an ion beam into a surface layer of the first active region by using the first resist pattern as a mask, a tilt angle of the ion beam being larger than a first angle between a first virtual plane and a second virtual plane, the first virtual plane including an edge of the first active region nearest to the first resist pattern and being perpendicular to a surface of the semiconductor substrate, the second virtual plane including the edge of the first active region nearest to the first resist pattern and including an uppermost edge of a sidewall of the first resist pattern on a side of the first active region, and an azimuth angle of the ion beam being selected in such a manner that ions passing through the uppermost edge of the sidewall of the first resist pattern on the side of the first active region are incident upon the edge of the first active region on the side of the first resist pattern, or incident upon the isolation insulating film between the first active region and the first resist pattern but not incident upon the first active region.