Patent ID: 8216895
Filing Date: 2012-07-10
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising: forming a first isolation insulating film in a semiconductor substrate to define a first region and a second region; forming a second isolation insulating film in the semiconductor substrate to define a third region and a fourth region; forming a first insulating film with a first thickness over the first region, the second region, the third region, the fourth region, the first isolation insulating film, and the second isolation insulating film; implanting a first impurity of a first conductivity type, through the first insulating film, into the first region, the second region, and the fourth region at a first depth in the semiconductor substrate; forming a second insulating film with a second thickness thinner than the first thickness over the first region, the second region, the third region, the fourth region, the first isolation insulating film, and the second isolation insulating film; implanting a second impurity of a second conductivity type, through the second insulating film, into the third region at a second depth in the semiconductor substrate; implanting a third impurity of the second conductivity type into the third region at a third depth shallower than the second depth; forming a first transistor including first source/drain regions of the first conductivity type in the third region; and forming a second transistor including second source/drain regions of the second conductivity type in the fourth region.