Patent ID: 8470677
Filing Date: 2013-06-25
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, the method comprising: forming a first gate insulating film in a first region of a semiconductor substrate; forming a second gate insulating film being thinner than the first gate insulating film in each of a second region and a third region of the semiconductor substrate; forming a first gate electrode, a second gate electrode, and a third gate electrode respectively on the first and second gate insulating films in the first region, the second region, and the third region; forming a first resist film covering the first region and having openings in the second region and the third region; forming pocket regions respectively on both sides of each of the second gate electrode and the third gate electrode by implanting ions of a first impurity of a first conductivity type into the semiconductor substrate while using the first resist film, the second gate electrode, and the third gate electrode as a mask; forming first extension regions respectively on both sides of the second gate electrode and first impurity regions respectively on both sides of the third gate electrode by implanting ions of a second impurity of a second conductivity type into the semiconductor substrate down to a depth shallower than the ions of the first impurity while using the first resist film as a mask; after removing the first resist film, forming a second resist film covering the second region and having openings in the first region and the third region; forming third extension regions respectively on both sides of the first gate electrode and second impurity regions respectively on both sides of the third gate electrode by implanting ions of a third impurity of the second conductivity type into the semiconductor substrate down to a depth shallower than the ions of the first impurity and deeper than the ions of the second impurity while using the second resist film, the first gate electrode, and the third gate electrode as a mask; and after removing the second resist film, forming source and drain regions respectively on both sides of each of the first gate electrode, the second gate electrode, and the third gate electrode by implanting ions of a fourth impurity of the second conductivity type into the semiconductor substrate down to a depth deeper than the ions of the first impurity.