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

Claim 7:
8. A pattern formation method, comprising:
forming a hard mask pattern over an underlying layer, the hard mask pattern including a first groove extending along a first axis and a second grove extending along the first axis and aligned with the first groove along the first axis interposing a first non-groove portion between the first groove and the second groove;
implanting ions into a first part of the first non-groove portion by using a first directional implantation process toward a first direction of the first axis and implanting ions into a second part of the first non-groove portion by a second directional implantation process toward a second direction of the first axis opposite to the first direction; and
performing a first directional etching process to etch the first part and a second directional etching process to etch the second part.