Patent ID: 8685825

Claim:
A method for fabricating a fin field effect transistor (finFET) with a fin having a source region, a drain region, and a channel region between the source and drain regions, the method comprising: etching the fin from a portion of a semiconductor substrate; depositing an isolation layer around and on the fin; etching the isolation layer back so that a top portion of two side surfaces of the fin are exposed while the isolation layer still covers a bottom portion of said two side surfaces of the fin; forming a gate stack on the channel region on a top surface of the fin and on the exposed top portion of the two side surfaces of the fin, the gate stack having an insulating layer in direct contact with the channel region, and a gate material in direct contact with the insulating layer; etching the source and drain regions to leave the channel region remaining; growing epitaxial semiconductor on the sides of the channel region that were adjacent the source and drain regions to form a source epitaxy region and a drain epitaxy region, respectively; and doping the epitaxial semiconductor in-situ while growing the epitaxial semiconductor; wherein etching the source and drain and growing the epitaxial semiconductor occur prior to etching the fin.