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

Claim 10:
11. 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 and a second region of a substrate, respectively, wherein the first fin structure and the second fin structure have a first sloped sidewall surface and a second slope sidewall surface respectively, and the first slope sidewall surface and the second slope sidewall surface have a first slope;
forming a mask layer over the second fin structure;
removing a portion of the first fin structure, so that the first fin structure has a first modified sidewall surface, wherein the first modified sidewall surface has a second slope different from the first slope;
removing the mask layer; and
forming a first isolation structure surrounding the first fin structure in the first region and a second isolation structure surrounding the second fin structure in the second region, wherein a first fin height of the first fin structure from a top surface of the first fin structure to a top surface of the first isolation structure is substantially equal to a second fin height of the second fin structure from a top surface of the second fin structure to a top surface of the second isolation structure.