Patent ID: 7982250

Claim:
A semiconductor device comprising: a substrate having an insulating surface; a first field-effect transistor formed over the insulating surface; a first insulating layer formed over the first field-effect transistor; an interlayer insulating layer formed over the first insulating layer; a second field-effect transistor formed over the interlayer insulating layer; a second insulating layer formed over the second field-effect transistor; and a conductive layer formed over the second insulating layer, wherein a contact hole is formed in the first insulating layer, the interlayer insulating layer, the second field-effect transistor, and the second insulating layer, wherein the conductive layer is formed in the contact hole, wherein the first field-effect transistor is electrically connected to the second field-effect transistor by the conductive layer, wherein the first field-effect transistor and the second field-effect transistor each have a single crystal semiconductor layer, wherein the single crystal semiconductor layer of the first field-effect transistor is doped with a first impurity which imparts first conductivity to the single crystal semiconductor layer of the first field-effect transistor, wherein the single crystal semiconductor layer of the second field-effect transistor is doped with a second impurity which imparts second conductivity to the single crystal semiconductor layer of the second field-effect transistor, wherein the first conductivity is opposite to the second conductivity, wherein the first insulating layer is arranged to provide one of tensile distortion and compression distortion to a channel formation region of the single crystal semiconductor layer of the first field-effect transistor, and wherein the second insulating layer is arranged to provide distortion, which is opposite to distortion provided to the channel formation region of the single crystal semiconductor layer of the first field-effect transistor, to a channel formation region of the single crystal semiconductor layer of the second field-effect transistor.