Patent ID: 7170110

Claim:
A semiconductor device, comprising: a substrate; a semiconductor layer provided in part of the substrate; a gate insulating film provided on the semiconductor layer; a gate electrode provided on the gate insulating film; source/drain regions of a first conductivity type defined in the semiconductor layer each to a side of the gate electrode; a channel region for carriers of a second conductivity type defined in the semiconductor layer between the source/drain regions of the first conductivity type; a body region of the second conductivity type that is defined in the semiconductor layer under the channel region for carriers of the second conductivity type and has a potential higher than that in the channel region for carriers of the second conductivity type with respect to carriers in a band edge where carriers flow; a conductor member for electrically connecting the gate electrode and the body region of the second conductivity type wherein the channel region for carriers of the second conductivity type is in direct contact with the gate insulating film; another semiconductor layer provided on the substrate; another gate insulating film provided on said another semiconductor layer; another gate electrode provided on said another gate insulating film; source/drain regions of the second conductivity type defined in said another semiconductor layer each to a side of said another gate electrode; a channel region for carriers of the first conductivity type defined in said another semiconductor layer between the source/drain regions of the second conductivity type; a body region of the first conductivity type that is defined in said another semiconductor layer under the channel region for carriers of the first conductivity type and has a potential higher than that in the channel region for carriers of the first conductivity type, with respect to carriers in a band edge where carriers flow; and another conductor member for electrically connecting said another gate electrode and the body region of the first conductivity type, wherein the semiconductor device functions as a complementary device, the body region in each of the semiconductor layers is made of Si, the channel region for carriers of the second conductivity type in the-semiconductor layer is made of Si 1-x-y Ge x C y (x≠0 and y≠0), the channel region for carriers of the second conductivity type in the semiconductor layer functions as an n-channel where electrons flow, the channel region for carriers of the first conductivity type in said another semiconductor layer is made of Si 1-x-y Ge x C y (x≠0 and y≠0), and the channel region for carriers of the first conductivity type in said another semiconductor layer functions as a p-channel where holes flow.