Patent ID: 11914295
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Optics (Instruments)
Classification: CPC G  C | IPC C  G

Claim 17:
18. A patterning process comprising:
forming an organic underlayer film on a body to be processed by using a coating-type organic underlayer film material;
forming a silicon-containing resist underlayer film on the organic underlayer film by using the composition for forming a silicon-containing resist underlayer film according to claim 13;
forming a photoresist film on the silicon-containing resist underlayer film by using a chemically amplified resist composition;
after heat treatment, exposing the photoresist film to an EUV beam and dissolving an exposed part of the photoresist film by using an alkaline developer to form a positive pattern;
transferring the pattern to the silicon-containing resist underlayer film by dry etching using the photoresist film having the formed pattern as a mask;
transferring the pattern to the organic underlayer film by dry etching using the silicon-containing resist underlayer film having the transferred pattern as a mask; and
further transferring the pattern to the body to be processed by dry etching using the organic underlayer film having the transferred pattern as a mask.