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

Claim 16:
17. A method of forming a semiconductor device, comprising:
providing a substrate including a circuit region and a well strap region;
forming first, second, and third wells in the substrate, each of the first, second, and third wells extending from the circuit region to the well strap region, the first and third wells sandwiching the second well, the first and third wells are of a first conductivity type and the second well is of a second conductivity type opposite to the first conductivity type;
forming first, second, and third mandrels over the first, second, and third wells in the well strap region, respectively, wherein the first and third mandrels have a first width and the second mandrel has a second width larger than the first width;
patterning the substrate with the first, second, and third mandrels to form first, second, and third fins over the first, second, and third wells in the well strap region, respectively;
forming first, second, and third epitaxial features over the first, second, and third fins, respectively;
electrically coupling the second epitaxial feature to a first power supply voltage of the semiconductor device; and
electrically coupling the first and third epitaxial features to a second power supply voltage of the semiconductor device, the first and second power supply voltages are different.