Patent ID: 11862465
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A pattern formation method, comprising:
forming a first pattern extending in a first direction and a second pattern extending in the first direction and spaced apart from the first pattern along a second direction crossing the first direction, over an underlying layer;
etching the first pattern and a part of the second pattern using a directional etching process along the second direction thereby removing the first pattern; and
patterning the underlying layer using the second pattern as an etching mask, wherein
the first pattern includes a first side face and a second side face opposite to the first side face, both of which extend in the first direction, and the second pattern includes a first side face and a second side face opposite to the first side face, both of which extend in the first direction, and the first side face of the second pattern faces the second side face of the first pattern, and
the directional etching is performed on the first side face of the first pattern and the first side face of the second pattern.