Patent ID: 11901190
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A method of patterning, the method comprising:
forming a first mask layer on a substrate;
forming a first pattern over the first mask layer;
removing a portion of the first mask layer using the first pattern to form first edges of a prescribed pattern on the substrate;
forming a second mask layer on the first mask layer;
forming a second pattern over the second mask layer;
prior to forming the second pattern, etching a portion of the substrate comprising a first material exposed by the first pattern to form an etched portion of the substrate;
removing a portion of the second mask layer using the second pattern to form one or more second edges of the prescribed pattern on the substrate to form a second patterned mask over the substrate to expose portions of the substrate; and
etching the substrate exposed through a first patterned mask and etching the substrate through the second patterned mask to form the prescribed pattern in the substrate.