Patent ID: 11862508
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 semiconductor fin extending from a top surface of a substrate;
forming a source/drain region extending into the semiconductor fin;
forming an isolation structure extending into the semiconductor fin adjacent to the source/drain region, wherein forming the isolation structure comprises:
forming a first dielectric material, wherein forming the first dielectric material comprises:
forming a first dielectric layer in a trench, the first dielectric layer having a first void in the trench; and
recessing the first dielectric layer to expose the first void, wherein remaining portions of the first dielectric layer forms the first dielectric material; and

forming a second dielectric material over the first dielectric material, wherein an interface between the first dielectric material and the second dielectric material is below the top surface of the semiconductor fin, wherein the first void extends from a surface of second dielectric material to a surface of the first dielectric material, wherein forming the second dielectric material comprises:
forming a second dielectric layer over the first dielectric material in the trench, the second dielectric layer having a second void in the trench; and
removing an upper portion of the second dielectric layer to completely remove the second void; and

forming a gate stack extending along a top surface and sidewalls of the semiconductor fin, the source/drain region being interposed between the isolation structure and the gate stack.