Patent ID: 7645665

Claim:
A method for manufacturing a semiconductor device, comprising the steps of: (x) forming an insulated gate electrode on an n-type active region in a semiconductor (a) implanting boron (B) ions into said n-type active region, using said insulated gate electrode as a mask; (b) implanting fluorine (F) or nitrogen (N) ions into said n-type active region, using said insulated gate electrode as a mask; (c) after said steps (x), (a) and (b) are performed, executing first annealing with a heating time of 100 msec or shorter relative to a region of said semiconductor substrate into which ions were implanted; and (d) after said step (c) is performed, executing second annealing with a heating time longer than the heating time of said first annealing, relative to the region of said semiconductor substrate into which ions were implanted, wherein said step (d) is carried out after said step (c) without an intervening ion implantation process.