Patent ID: 11949014
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A method for forming a fin field effect transistor (FinFET) device structure, comprising:
forming a first fin structure and a second fin structure in a first region of a substrate and a third fin structure and a fourth fin structure in a second region of the substrate, wherein the first fin structure, the second fin structure, the third fin structure and the fourth fin structure each has a first fin width gradually decreasing from bottom portions to top portions of the first fin structure, the second fin structure, the third fin structure and the fourth fin structure;
etching portions of the first fin structure and the second fin structure, wherein a first pitch between the first fin structure and the second fin structure is different from a second pitch between the third fin structure and the fourth fin structure after etching; and
forming an isolation structure surrounding the first fin structure, the second fin structure, the third fin structure and the fourth fin structure, wherein a first depth of the isolation structure in the first region is substantially equal to a second depth of the isolation structure in the second region.