Patent ID: 11894238
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method comprising:
forming a first material layer over a substrate;
forming a second material layer over the first material layer;
forming a first trench in the second material layer, wherein the first trench extends along a first direction;
forming a first spacer layer in the first trench;
after forming the first spacer layer in the trench, forming a second trench in the second material layer;
removing a first portion of the first material layer to extend the first trench into the first material layer and removing a second portion of the first material layer to extend the second trench into the first material layer thereby forming a patterned first material layer;
forming a third material layer over the patterned first material layer;
forming a third trench extending through the third material layer to thereby form a patterned third material layer, wherein the third trench extends along a second direction that is different than the first direction, wherein the third trench overlaps the extended first trench; and
removing a third portion of the patterned first material layer through the third trench.