Patent ID: 11908865
Assignee: SEMICONDUCTOR MANUFACTURING INTERNATIONAL (SHANGHAI) CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. The method according to claim 13, wherein forming the first work function layer and the second work function layer comprises:
forming a first work function material film in the opening and on a surface of the dielectric layer,
planarizing the first work function material film until the surface of the dielectric layer is exposed, to form an initial first work function layer in the opening,
removing the initial first work function layer over the second region and the second portion of the isolation region, to form the first work function layer in the opening over the first region and the first portion of the isolation region,
forming a second work function material film on a surface of the first work function layer, on the surface of the dielectric layer, and in the opening, and
planarizing the second work function material film until the surface of the dielectric layer is exposed, to form the second work function layer in the opening over the second region and the second portion of the isolation region.