Patent ID: 11915979
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A device comprising:
a semiconductor substrate;
a gate dielectric over the semiconductor substrate, wherein the gate dielectric comprises a high-k material and a passivating species, and wherein the passivating species is fluorine or nitrogen;
a gate stack over the gate dielectric, wherein the gate stack comprises:
a work function metal layer comprising aluminum and the passivating species;
a capping layer over the work function metal layer, wherein the capping layer comprises aluminum and the passivating species, wherein a concentration of the aluminum in the capping layer decreases in a direction away from the work function metal layer; and
a fill metal over the capping layer wherein the fill metal is free of the passivating species.