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

Claim 14:
15. A method of patterning, the method comprising:
forming a first mask layer on a substrate having two or more materials to be provided with a prescribed pattern having one or more first edges in a first direction and one or more second edges in a second direction, the second direction being arranged at a non-zero angle to the first direction;
forming a first pattern over the first mask layer;
removing a portion of the first mask layer using the first pattern to form the one or more first edges of the prescribed pattern on the substrate to form a first patterned mask;
forming a second mask layer on the first mask layer;
forming a second pattern over the second mask layer;
removing a portion of the second mask layer using the second pattern to form the one or more second edges of the prescribed pattern on the substrate to form a second patterned mask over the substrate exposing portions of the substrate, wherein at least a portion of the second pattern overlaps the first pattern such that at least one of the first edges intersects with at least one of the second edges to form a first corner of the prescribed pattern;
prior to forming the second pattern, filling the first pattern with a first filler having a different etch selectivity from a material of the first mask layer, wherein a material of the first filler is titanium nitride; and
etching the substrate exposed through the first patterned mask and etching the substrate exposed through the second patterned mask to form the prescribed pattern in the substrate.