Patent ID: 8790970

Claim:
A method of doping semiconductor fins of multiple-gate transistors, the method comprising: providing a semiconductor structure comprising of a plurality of semiconductor fins overlying an insulator layer, each fin having a gate dielectric overlying a portion of that semiconductor fin, and a gate electrode overlying said gate dielectric, each of the semiconductor fins having a channel region of a first conductivity type disposed beneath the gate electrode, the channel region located in a top surface, a first sidewall surface, and a second sidewall surface of the semiconductor fin; and forming a source region and/or drain region comprising: implanting dopant ions of an opposite second conductivity type in the first sidewall surface and in the top surface at an angle α to dope along the first sidewall surface and along the top surface, the angle α being between 26 degrees and about 63 degrees with respect to the normal of the top surface and being in a first plane perpendicular to the first sidewall surface, the normal of the top surface being in the first plane; and implanting dopant ions of the second conductivity type in the second sidewall surface and in the top surface at an angle β to dope along the second sidewall surface and along the top surface, the angle β being between 26 degrees and about 63 degrees with respect to the normal of the top surface and being in a second plane perpendicular to the second sidewall surface, the normal of the top surface being in the second plane.