Patent ID: 7256078

Claim:
A method of forming an integrated circuit structure having a first-type fin-type field effect transistor (FinFET) and a second-type FinFET above a buried oxide (BOX) layer, said method comprising: providing a structure having a first-type layer and a second-type layer separated by said BOX layer, removing a portion of said first-type layer to expose a portion of said BOX layer; thinning an exposed portion of said BOX layer; forming a seed opening through said exposed portion of said BOX layer; growing a second-type material from said second-type layer through said seed opening; patterning said first-type layer into a first fin and said second-type material into a second fin; forming gate, source, and drain regions for said first fin to create said first-type FinFET; and forming gate, source, and drain regions for said second fin to create said second-type FinFET, wherein a first region of said BOX layer below said first fin is thicker above said second-type layer when compared to a second region of said BOX layer below said second fin, and wherein said second fin is taller than said first fin.