Patent ID: 8841742

Claim:
A method of transferring a layer of semiconductor material from a first donor structure to a second structure, comprising: forming recesses extending a distance into a first donor structure from a surface of the first donor structure; implanting ions into the first donor structure to form a generally planar weakened zone within the first donor structure defined by the implanted ions, the generally planar weakened zone separating the layer of semiconductor material from a remainder of the first donor structure, the recesses extending at least partially through the layer of semiconductor material, the generally planar weakened zone having at least one characteristic that varies within the generally planar weakened zone in at least one direction parallel to the generally planar weakened zone; providing a material within the recesses; bonding the first donor structure to the second structure; and fracturing the first donor structure along the generally planar weakened zone and leaving the layer of semiconductor material bonded to the second structure.