Patent ID: 11923359
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. A fin field effect transistor (FinFET) device structure, comprising:
a first fin structure formed over a first region of a substrate;
a second fin structure formed over a second region of the substrate;
a first liner layer over a bottom portion of the first fin structure;
a first gate dielectric layer over the first liner layer and the first fin structure, wherein a first interface between the first liner layer and the first gate dielectric layer, and the first interface is sloped; and
a second gate dielectric layer formed over the second fin structure, wherein the first gate dielectric layer is separated from the second gate dielectric layer,
wherein the first fin structure has a first bottom portion and a first top portion, the first bottom portion and the first top portion are made of different materials, a second interface is between the first bottom portion and the first top portion, and the second interface is in direct contact with the first interface.