Patent ID: 11942552
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 16:
17. A method of manufacturing a semiconductor device, comprising:
forming fin structures each having a semiconductor fin and a hard mask layer on the semiconductor fin, an upper portion of each of the semiconductor fins protruding from an isolation insulating layer;
forming a sacrificial cladding layer over at least sidewalls of the hard mask layer and the upper portion of each of the semiconductor fins;
forming a first dielectric layer to partially fill a space between the semiconductor fins;
forming a second dielectric layer made of a different material than the first dielectric layer over the first dielectric layer to fully fills the space;
recessing the second dielectric layer; and
forming a third dielectric layer made of a different material than the second dielectric layer on the recessed second dielectric layer, thereby forming a wall fin structure between the fin structures.