Patent ID: 8466496
Filing Date: 2013-06-18
Classification: H01L

Abstract:
1. A method of forming a semiconductor device comprising: providing a substrate including at least one first active region that is in direct contact with at least one second active region; forming a first work function metal layer over a first channel region of the at least one first active region of the substrate, and a second work function metal layer over a second channel region of the at least one second active region of the substrate; forming an isolation region into the substrate at an interface between the at least one first active region and the at least one second active region following the formation of the first work function metal layer and the second work function metal layer, wherein the isolation region separates the first work function metal layer that is present on the at least one first active region from the second work function metal layer that is present on the at least one second active region; and forming a gate stack across the isolation region from the at least one first active region to the at least one second active region of the substrate, the gate stack is in contact with the first work function metal layer on the at least one first active region and the second work function metal layer on the at least one second active region, wherein the gate stack includes at least one metal nitride layer that is present on the at least the first work function metal layer and the second work function metal layer, and at least one semiconductor gate conductor layer that is present on the at least one metal nitride layer.