Patent ID: 7781840

Claim:
A semiconductor device comprising: a first transistor, the first transistor having a channel region in a first semiconductor layer ( 16 ) having a first crystal orientation, the first semiconductor layer is located over a first insulator layer ( 14 ); a second transistor ( 42 ), the second transistor having a channel region in a second semiconductor layer ( 34 ) having a second crystal orientation, the second semiconductor layer is located over a second insulator layer ( 32 ), wherein a first crystal orientation is different from that of the second crystal orientation; a semiconductor structure ( 12 ), the first insulator layer located over the semiconductor structure and the second insulator layer located over the semiconductor structure; and a third semiconductor layer ( 38 ) located over the semiconductor structure and under the second insulator layer, wherein a combined thickness of the third semiconductor layer and the second insulator layer is about the same as the first thickness; wherein: wherein the first insulator has a first thickness; the semiconductor structure has the second crystal orientation; the first semiconductor layer and the first insulator layer have a first interface; the second semiconductor layer and the second insulator layer have a second interface; the first interface and the second interface are about even relative to a top surface of the semiconductor structure; and the first insulator layer is located on the semiconductor structure.