Patent ID: 11955485
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A semiconductor device, comprising:
a first field effect transistor (FET) including a first gate structure extending in a first direction and disposed over a first fin structure extending in a second direction crossing the first direction; and
a second FET having different conductivity type than the first FET and including a second gate structure extending in the first direction and disposed over a second fin structure extending in the second direction, wherein:
the first fin structure and the second fin structure are parallel to each other,
the first gate structure is aligned with the second gate structure along the first direction,
the first gate structure includes:
a first gate dielectric layer disposed over the first fin structure;
a second gate dielectric layer disposed over the first gate dielectric layer;
a first work function adjustment material (WFM) layer disposed over the second gate dielectric layer; and
a first metal gate electrode layer disposed over the first WFM,

the second gate structure includes:
a third gate dielectric layer disposed over the second fin structure;
a fourth gate dielectric layer disposed over the second fin structure;
a second WFM layer disposed over the fourth gate dielectric layer; and
a second metal gate electrode layer disposed over the second WFM,

the first metal gate electrode layer and the second metal gate electrode layer are continuously formed along the first direction,
the first gate dielectric layer is separated from the third gate dielectric layer by a gap,
at least one of the first gate dielectric layer or the third gate dielectric layer includes a dopant,
the dopant is at least one selected from the group consisting of La, Sc, Sr, Ce, Y, Dy, Eu and Yb, and
a dopant concentration in the first gate dielectric layer and the second gate dielectric layer is different.