Patent ID: 7691733

Claim:
A method for forming a hybrid orientation substrate comprising forming a direct-silicon-bonded (DSB) bilayer comprising an upper single-crystal Si layer having a first surface orientation disposed on a lower single-crystal Si layer having a second surface orientation different from the first surface orientation, selecting a plurality of first Si bilayer regions and a plurality of second Si bilayer regions, wherein said upper single-crystal Si layer will retain its original first surface orientation in said first bilayer regions and undergo an orientation change to a second surface orientation in said second bilayer regions; forming trench isolation around said first and second Si bilayer regions to produce isolation-bordered first and second Si bilayer regions; amorphizing said first-orientation upper single-layer crystal Si layer in said second Si bilayer regions to form localized amorphized regions while leaving at least some of said second-orientation lower-single crystal Si layer in said second Si bilayer regions crystalline; and melting said localized amorphized regions and recrystallizing them to said second surface orientation using said second-orientation lower-layer Si in said second bilayer regions as a template, wherein process conditions used to effect said melting and recrystallization are selected to avoid any orientation change in said first bilayer regions.