Patent ID: 11937415
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of forming a semiconductor device, comprising:
providing a substrate including a circuit region and a well strap region;
forming a mandrel extending from the circuit region to the well strap region;
depositing mandrel spacers on sidewalls of the mandrel in the circuit region and the well strap region;
removing the mandrel in the circuit region, while the mandrel in the well strap region remains intact;
patterning the substrate with the mandrel spacers in the circuit region and the mandrel in the well strap region as an etch mask, thereby forming at least a first fin in the circuit region and a second fin in the well strap region, wherein a width of the second fin is larger than a width of the first fin; and
epitaxially growing a first epitaxial feature over the first fin in the circuit region and a second epitaxial feature over the second fin in the well strap region.