The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 15, 2022
Filed:
Aug. 19, 2020
Applicant:
Tokyo Electron Limited, Tokyo, JP;
Inventors:
Assignee:
TOKYO ELECTRON LIMITED, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 21/768 (2006.01); H01L 21/033 (2006.01); H01L 21/311 (2006.01); H01L 21/3213 (2006.01); H01L 27/11556 (2017.01); H01L 27/11582 (2017.01);
U.S. Cl.
CPC ...
H01L 21/76816 (2013.01); H01L 21/0332 (2013.01); H01L 21/0335 (2013.01); H01L 21/31116 (2013.01); H01L 21/31144 (2013.01); H01L 21/32135 (2013.01); H01L 21/32139 (2013.01); H01L 21/76877 (2013.01); H01L 27/11556 (2013.01); H01L 27/11582 (2013.01);
Abstract
There is formed, on a stack formed by alternately stacking an oxide film and a nitride film or an oxide film and a polysilicon film on a substrate, a hard mask in which two or more kinds of lines made of mutually different materials are arranged in order. Then, a photoresist is applied onto the hard mask. Furthermore, the photoresist is trimmed until one line is exposed from the end of the hard mask. Moreover, one line of the hard mask exposed beneath the photoresist is etched. Furthermore, a part of the stack exposed beneath the hard mask is etched. The etching of the photoresist, the hard mask, and the stack is repeated while changing etching conditions.