Patent ID: 11935752
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A device comprising:
a gate structure over a substrate;
a composite dielectric layer over the gate structure and comprising:
a first nitrogen-rich layer on and in contact with the gate structure;
a first oxygen-rich layer on and in contact with the first nitrogen-rich layer;
a second nitrogen-rich layer on and in contact with the first oxygen-rich layer, wherein a topmost surface of the first nitrogen-rich layer is substantially coplanar with a topmost surface of the second nitrogen-rich layer and the topmost surface of the first oxygen-rich layer is substantially coplanar with a topmost surface of the first oxygen-rich layer; and
a second oxygen-rich layer on and in contact with the second nitrogen-rich layer; and

a gate spacer laterally surrounding the gate structure and the composite dielectric layer; and
source/drain features on the substrate and on opposite sides of the gate structure.