Patent ID: 8012256

Claim:
A method of fabricating a quasi-substrate wafer with a subcarrier wafer and a growth layer, the method comprising: providing a growth substrate wafer comprising a desired material of said growth layer and having a first main face and a second main face, forming a separation zone disposed along said first main face in said growth substrate wafer, the formed separation zone configured to cause a stress that leads to a first change in the radius (R) of curvature of said first main face of said growth substrate wafer; providing said growth substrate wafer with another stress that causes a second change in the radius (R) of curvature of said first main face of said growth substrate wafer, said second change in the radius (R) of curvature being opposite in direction to said first change in the radius (R) of curvature; bonding said growth substrate wafer to a subcarrier wafer with said first main face of said growth substrate wafer facing said subcarrier wafer; detaching a portion of said growth substrate wafer that faces away from said subcarrier wafer, as viewed from said separation zone along said separation zone.