Patent ID: 7312134
Filing Date: 2007-12-25
Classification: H01L,Y10S

Abstract:
1. A method of forming a substrate comprising: providing an initial structure comprising a Si-containing substrate having a tensile dielectric positioned on a first surface of said Si-containing substrate and a compressive dielectric positioned on a second surface of said Si-containing substrate, said tensile dielectric and said compressive dielectric separated by an insulating material; removing said insulating material to expose a portion of said Si-containing substrate between said first surface and said second surface of said Si-containing substrate; recessing said Si-containing substrate from said first and said second surface of said Si-containing substrate to provide recessed portions of said Si-containing substrate adjacent said first surface of said substrate and said second surface of said substrate; forming an oxide positioned on recessed portions of said Si-containing substrate, said oxide being coplanar to an upper surface of said compressive layer and said tensile layer to provide a planar top surface; bonding a wafer to said planar top surface; implanting said Si-containing substrate to provide a damaged interface; separating said Si-containing substrate about said damaged interface, wherein a damaged surface of said Si-containing substrate remains; planarizing said damaged surface of said Si-containing substrate stopping on a surface of said oxide on said recessed portions of said Si-containing substrate, wherein planarizing said Si-containing substrate to said oxide produces a semiconducting layer atop said tensile material and said compressive material; and removing said oxide, wherein said tensile dielectric transfers a compressive stress to said semiconducting layer and said compressive dielectric transfers a tensile stress to said semiconducting layer.