US Patent 9954080 3D integrated circuit device

A 3D integrated circuit device, including: a first transistor; a second transistor; and a third transistor, where the third transistor is overlaying the second transistor and the second transistor is overlaying the first transistor, where the first transistor controls the supply of a ground or a power signal to the third transistor, and where the first transistor, the second transistor and the third transistor are aligned to each other with less than 100 nm misalignment.