Patent ID: 11901218
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A method of forming a semiconductor device, the method comprising:
forming a first plurality of fins in a first region of a substrate, wherein the first plurality of fins have a first fin density;
forming a second plurality of fins in a second region of the substrate, wherein the second plurality of fins have a second fin density that is greater than the first fin density;
filling a first recess between adjacent fins of the first plurality of fins with a first dielectric material;
filling a second recess between adjacent fins of the second plurality of fins with the first dielectric material; and
converting the first dielectric material in the first recess and the second recess to a second dielectric material, wherein during converting the first dielectric material, a first conversion rate of the first dielectric material in the first recess is greater than a second conversion rate of the first dielectric material in the second recess.