Patent ID: 8580659

Claim:
A method of fabricating high-mobility dual channel material based on SOI substrate, comprising the following steps: Step 1, form an epitaxial SiGe layer having compressive stress on a SOI substrate, wherein said SOI substrate is composed of a silicon substrate, an insulating buried layer and a silicon top layer from down to up; Step 2, form a Si cap layer on said SiGe layer; Step 3, form a photoresist layer on said Si cap layer and expose part of Si cap layer by lithography and etch; Step 4, continue epitaxial growth of a Si layer on exposed Si cap layer; Step 5, perform ion implantation to distribute implanted ions within the silicon top layer of SOI substrate; Step 6, perform annealing process to relax the stress in part of SiGe layer and thus transfer stress to the epitaxial Si material thereon to form strained silicon; the formed strained silicon is used to form NMOSFET channel and the region of SiGe layer covered by photoresist is used to form PMOSFET channel.