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

Claim 16:
17. A method, comprising:
forming a first hard mask over a semiconductor substrate and a second hard mask over the first hard mask, wherein the first hard mask and the second hard mask have different compositions;
patterning the second hard mask to form a first pattern over the first hard mask, the first pattern including first portions and second portions oriented along different directions, wherein each of the second portions includes a first sidewall and a second sidewall opposite to the first sidewall; and
performing an oblique deposition process along a direction away from a normal of the semiconductor substrate to selectively deposit a third hard mask over the first pattern, resulting in a top surface of the first pattern and the first sidewalls of the second portions covered with the third hard mask and the second sidewalls of the second portions free of the third hard mask, wherein the third hard mask differs from the first hard mask and the second hard mask in composition.