Patent ID: 11908920
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A semiconductor device comprising:
a fin that protrudes above a substrate;
isolation regions on opposite sides of the fin;
a gate structure over the fin, wherein the gate structure comprises a gate dielectric layer and a gate electrode over the gate dielectric layer;
gate spacers along opposite sidewalls of the gate structure, wherein a lower portion of the gate structure extends into the isolation regions, wherein the lower portion of the gate structure tapers off as the gate structure extend toward the isolation regions; and
a gate fill material along sidewalls of the lower portion of the gate structure, wherein the gate fill material is between the gate spacers and the gate structure, wherein a width of the gate fill material along the sidewalls of the lower portion of the gate structure increases as the gate fill material extends toward the isolation regions.