Patent ID: 11955338
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC H  C | IPC C  H

Claim 8:
9. A method, comprising:
providing a semiconductor substrate, a first material layer disposed over a top surface of the semiconductor substrate, and a second material layer disposed over the first material layer, wherein the second material layer differs from the first material layer in composition;
forming a first pattern in the second material layer, the first pattern including first mandrels and second mandrels oriented in different directions, wherein the second mandrels each have a first sidewall and a second sidewall opposite to the first sidewall;
depositing a third material layer over the first pattern, wherein the third material layer is deposited on the first sidewall but not on the second sidewall of the second mandrels, and wherein the third material layer differs from the first material layer and the second material layer in composition; and
etching portions of the third material layer formed over the first pattern, resulting in the third material layer to remain on the first sidewall but not on the second sidewall of the second mandrels.