Patent ID: 8445963

Claim:
A multi-gate device comprising: a substrate comprising: a first semiconductor layer comprising a first semiconductor material with at least a first carrier mobility enhancing parameter, a buried insulating layer on the first semiconductor layer, and a second semiconductor layer comprising a second semiconductor material with at least a second carrier mobility enhancing parameter on the buried insulating layer, the second carrier mobility enhancing parameter being different from the first carrier mobility enhancing parameter; a first active region and a second active region in the substrate, the first active region comprises at least a first fin, the first fin grown on top and in contact with the first semiconductor layer, the first fin comprising at least the first semiconductor material, the second active region comprises at least a second fin, the second fin grown on top and in contact with the second semiconductor layer, the second fin comprising at least the second semiconductor material; a dielectric layer over the second semiconductor layer, the dielectric layer in between the at least first fin and the at least second fin, the at least first fin and the at least second fin protruding through and above the dielectric layer; and an insulating layer covering the whole sidewalls of the first fin and located between the sidewalls and the buried insulating layer, the second semiconductor layer, and the dielectric layer, wherein the first active region is electrically isolated from the second active region by the buried insulating layer, the insulating layer, and the dielectric layer.