Patent ID: 8329528

Claim:
A method of manufacturing a semiconductor device including an n-channel transistor formed in a first device region of a silicon substrate, and a p-channel transistor formed in a second device region of the silicon substrate, comprising: forming a first gate electrode of the n-channel transistor over the first device region with a first gate insulating film formed therebetween, a second gate electrode of the p-channel transistor over the second device region with a second gate insulating film formed therebetween; forming a first insulating film having a Young's modulus smaller than a Young's modulus of silicon over the silicon substrate with the first gate electrode and the second gate electrode formed on; etching the first insulating film in the second device region to thereby make the first insulating film in the second device region thinner than the first insulating film in the first device region; forming over the first insulating film a second insulating film having a Young's modulus larger than the Young's modulus of silicon; etching the second insulating film and the first insulating film to thereby form a first sidewall insulating film on a side wall of the first gate electrode, and form a second sidewall insulating film on a side wall of the second gate electrode; and forming, covering the n-channel transistor, a tensile stressor film which applies to a channel region of the n-channel transistor a compressive stress perpendicular to a channel plane and a tensile stress in a channel length direction, and forming, covering the p-channel transistor, a compressive stressor film which applies to a channel region of the p-channel transistor a tensile stress perpendicular to a channel channel plane and a compressive stress in a channel length direction, wherein the first sidewall insulating film includes the first insulating film and has a Young's modulus smaller than the Young's modulus of silicon, and the second sidewall insulating film includes a layer structure of the first insulating film and the second insulating film and has a Young's modulus which is larger than the Young's modulus of silicon and is larger than the Young's modulus of the first sidewall insulating film.