Patent ID: 11901218
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, the method comprising:
etching a first trench in a first region of a semiconductor substrate to form a first fin and a second fin that are disposed on opposites sides of the first trench, wherein the first trench has a first depth and a first width;
etching a second trench in a second region of the semiconductor substrate to form a third fin and a fourth fin that are disposed on opposites sides of the second trench, wherein the second trench has a second depth that is smaller than the first depth, and wherein the second trench has a second width that is smaller than the first width;
depositing a first dielectric material over the first fin, the second fin, the third fin and the fourth fin to form a first dielectric layer that fills the first trench and the second trench; and
converting an entire thickness of the first dielectric layer in the first trench and an entire thickness of the first dielectric layer in the second trench to a second dielectric material wherein a concentration of nitrogen in the second dielectric material in the second trench is within 10 percent of a concentration of nitrogen in the second dielectric material in the first trench.