Patent ID: 7968384

Claim:
A method of horizontally stacking or integrating transistors on a common semiconductor substrate comprising the steps of: providing a single crystal semiconductor substrate; forming a plurality of transistors on the single crystal semiconductor substrate; encapsulating the plurality of transistors in an insulating layer; forming an opening through the insulating layer between the plurality of transistors, the opening exposing a surface of the single crystal semiconductor substrate; epitaxially growing a first layer of single crystal rare earth insulator material on the exposed surface of the single crystal semiconductor substrate, the first layer of single crystal rare earth insulator material being chosen to be substantially lattice matched with the single crystal semiconductor substrate; epitaxially growing a first layer of single crystal semiconductor material on the first layer of single crystal rare earth insulator material, the first layer of single crystal semiconductor material being substantially lattice matched with the first layer of single crystal rare earth insulator material; and forming an intermixed transistor on the first layer of single crystal semiconductor material.