Patent ID: 11942475
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A structure, comprising:
a first region of a substrate, wherein the first region comprises a polysilicon transistor structure that includes:
a first source/drain region having a lightly doped portion;
a gate dielectric disposed above the substrate, wherein an edge of the gate dielectric coincides with an edge of the lightly doped portion;
a polysilicon gate electrode, on the gate dielectric; and
a first spacer structure along a sidewall of the polysilicon gate electrode; and

a second region of the substrate, wherein the second region comprises a metal transistor structure with a length shorter than that of the polysilicon transistor structure, and wherein the metal transistor structure comprises:
a high-k gate dielectric;
a metal gate electrode, on the high-k gate dielectric, with a sidewall that coincides with a sidewall of the high-k gate dielectric;
a second spacer structure, wherein a bottom surface of the second spacer structure is coplanar with a bottom surface of the high-k gate dielectric; and
a second source/drain region substantially co-planar with the first source/drain region.