Patent ID: 7767510

Claim:
A method of fabricating a semiconductor device, comprising: providing a strained silicon substrate comprising a first substrate, and a strained silicon layer formed with a ( 100 ) crystal orientation over the first substrate; forming an oxide layer of less than one monolayer thickness over the strained silicon layer; providing a second substrate having a surface silicon material with a ( 110 ) crystal orientation; bonding the strained silicon substrate at the oxide layer to the surface silicon material of the second substrate thereby providing a composite structure; removing the first substrate from the composite structure and dissolving the oxide layer, leaving the strained silicon layer with the ( 100 ) crystal orientation in contact with the second substrate silicon material with the ( 110 ) crystal orientation; masking the strained silicon layer to cover an NMOS region and to leave exposed a PMOS region; implanting the exposed PMOS region with silicon or germanium, or both, to amorphize the strained silicon layer at the exposed PMOS region; re-crystallizing the amorphized PMOS region using solid phase epitaxy to match the ( 110 ) crystal orientation of the second substrate silicon material in the re-crystallized PMOS region; unmasking the covered NMOS region; forming an NMOS device at the NMOS region; and forming a PMOS device at the re-crystallized PMOS region.