Patent ID: 7569890

Claim:
A CMOS type semiconductor device, comprising: a semiconductor substrate which has pMOS transistor formation areas and nMOS transistor formation areas; a first gate insulating film formed over the semiconductor substrate of the pMOS transistor formation area; and a gate electrode formed over the first gate insulating film; wherein at least nitrogen and halogen are included in the first gate insulating film of at least a portion of the pMOS transistor formation areas and the halogen is included in the pMOS transistor formation area; a concentration of the halogen in the nMOS transistor formation area is lower than a concentration of halogen in the pMOS transistor formation area; and a concentration of the halogen near a boundary of the semiconductor substrate and the first gate insulating film is higher than a concentration of the halogen near a boundary of the first gate insulating film and the gate electrode.