Patent ID: 7563678

Claim:
A method of manufacturing a semiconductor device comprising, in the following order: forming, in a semiconductor substrate including a first semiconductor region of a first conductivity type and a second semiconductor region of a second conductivity type, a first dummy gate in the first semiconductor region and forming a second dummy gate in the second semiconductor region; forming first source and drain regions of the first conductivity type in the second semiconductor region at both sides of the second dummy gate; forming second source and drain regions of the second conductivity type in the first semiconductor region at both sides of the first dummy gate; forming an insulating film at side portions of the first and second dummy gates so that the first source and drain regions and the second source and drain regions are covered; forming first and second grooves in the insulating layer by removing the first and second dummy gates; forming a gate insulating film at least at bottom portions of the first and second grooves; forming first and second gate electrodes on the gate insulating film at the bottom portions of the first and second grooves; and performing thermal processing in an atmosphere containing oxygen molecules.