Patent ID: 9379221
Filing Date: 2016-06-28
CPC Classification: H01L

Claim Text:
1. A method of fabricating a replacement metal gate in a transistor device, the method comprising: forming a dummy gate structure over a substrate, the dummy gate structure surrounded by an insulating layer; removing the dummy gate structure so as to expose a trench within the insulating layer; conformally depositing a dielectric material layer and a work function metal layer over a the insulating layer and in the trench and removing the dielectric material layer and the work function metal layer from a top surface of the insulating layer; recessing the work function metal layer below a top of the trench; selectively growing a gate metal only on exposed surfaces of the work function metal layer; forming a dielectric cap over the gate metal to fill the trench; and removing the dielectric cap and performing a metal fill of the trench, wherein the removing the dielectric cap and the performing the metal fill is performed when the selectively growing the gate metal results in a gap within the inner wall of the trench.