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

Claim 0:
1. A fin field effect transistor (FinFET) device structure, comprising:
a first fin structure extending above an isolation structure over a substrate, wherein the first fin structure has a bottom portion and a top portion, the bottom portion and the top portion of the first fin structure are made of different materials, a first interface is between the top portion and the bottom portion;
a first liner layer formed on a first sidewall surface of the first fin structure, wherein the first liner layer has an outer surface in contact with the first fin structure and an inner surface in contact with the isolation structure; and
a gate dielectric layer formed over the first fin structure and the first liner layer, wherein a second interface between the first liner layer and the gate dielectric layer, and the second interface is in direct contact with the first interface, wherein a sidewall surface of the gate dielectric layer is aligned with the inner surface of the first liner layer.