Patent ID: 7109568

Claim:
A semiconductor device including a semiconductor substrate, a gate electrode and a plurality of transistors formed on the semiconductor substrate, the plurality of transistors being disposed with a drain and a source corresponding to the gate electrode, an insulating film formed above the transistors, with a direction joining the source and the corresponding drain of the transistors being formed in a direction along a <100> crystal axis or an axis equivalent to the <100> crystal axis, the transistors including a plurality of n-channel field-effect transistors and plurality of p-channel field-effect transistors, the insulating film including tensile stress, the insulating film that is formed in regions at the peripheries of the p-channel field-effect transistors and positioned in directions parallel and orthogonal to the direction joining the source and the drain including an insulating film that is thinner than the insulating film that is formed in regions at the peripheries of the n-channel field-effect transistors and positioned in directions parallel and orthogonal to the direction joining the source and the drain.