Patent ID: 7829956

Claim:
A semiconductor device comprising: a first MIS transistor including a first gate insulating film formed on a first active region which is made of a semiconductor layer and which is defined by a shallow trench isolation region formed in the semiconductor layer, a first gate electrode formed on the first gate insulating film, and first source/drain regions of an N type formed in regions of the first active region located to both sides of the first gate electrode; a first insulating film covering the first source/drain regions and the first gate electrode and having a compressive stress; a second MIS transistor including a second gate insulating film formed on a second active region which is made of the semiconductor layer and is defined by the shallow trench isolation region formed in the semiconductor layer, a second gate electrode formed on the second gate insulating film, and second source/drain regions of the N type formed in regions of the second active region located to both sides of the second gate electrode; a second insulating film covering the second source/drain regions and the second gate electrode and having a tensile stress; a third MIS transistor including a third gate insulating film formed on a third active region which is made of the semiconductor layer and which is defined by the shallow trench isolation region formed in the semiconductor layer, a third gate electrode formed on the third gate insulating film, and third source/drain regions of a P type formed in regions of the third active region located to both sides of the third gate electrode, a third insulating film covering the third source/drain regions and the third gate electrode and having a compressive stress, and an interlayer dielectric covering the first insulating film, the second insulating film, and the third insulating film, wherein the first, second and third active regions are electrically isolated by the shallow trench isolation region, and the first, second and third gate insulating films have a same thickness.