Patent ID: 11966164
Assignee: NISSAN CHEMICAL CORPORATION
Field: Optics (Instruments)
Classification: CPC G  C | IPC G

Claim 0:
1. A method for producing a semiconductor device, the method comprising
a step (A) of applying, onto a semiconductor substrate, a resist underlayer film-forming composition containing (1) a hydrolysis condensate prepared through hydrolysis and condensation of a hydrolyzable silane in a non-alcoholic solvent in the presence of a strong acid, and (2) at least one of the hydrolyzable silane and a hydrolysis product of the hydrolyzable silane, followed by baking the composition, to thereby form a resist underlayer film;
a step (B) of applying a resist composition onto the resist underlayer film to thereby form a resist film;
a step (C) of exposing the resist film to light;
a step (D) of developing the resist film after the light exposure to thereby form a patterned resist film;
a step (E) of etching the resist underlayer film with the patterned resist film;
a step (F) of processing the semiconductor substrate with the patterned resist film and resist underlayer film; and
a step (G) of removing at least 90% in terms of thickness of the patterned resist underlayer film with a sulfuric acid-hydrogen peroxide mixture (SPM) prepared by mixing of aqueous hydrogen peroxide with sulfuric acid and/or an ammonia-hydrogen peroxide mixture (SC1) prepared by mixing of aqueous hydrogen peroxide with aqueous ammonia, wherein the patterned resist underlayer film is removed in a single step application of the sulfuric acid-hydrogen peroxide mixture and/or the ammonia-hydrogen peroxide mixture, and wherein:
the hydrolyzable silane contains a hydrolyzable silane of the following Formula (1):

R1aR2bSi(R3)4−(a+b)  Formula (1), wherein R1 is an organic group having a primary amino group, a secondary amino group, or a tertiary amino group and is bonded to a silicon atom via an Si—C bond; R2 is an alkyl group, an aryl group, a halogenated alkyl group, a halogenated aryl group, an alkoxyaryl group, an alkenyl group, an acyloxyalkyl group, or an organic group having an acryloyl group, a methacryloyl group, a mercapto group, an amino group, an amide group, a hydroxyl group, an alkoxy group, an ester group, a sulfonyl group, or a cyano group, or any combination of these groups, and is bonded to a silicon atom via an Si—C bond; le and R2 are optionally bonded together to form a ring structure; R3 is an alkoxy group, an acyloxy group, or a halogen group; a is an integer of 1; b is an integer of 0 to 2; and a+b is an integer of 1 to 3;
the hydrolyzable silane of Formula (1) is selected from the group consisting of:, , , wherein T represents an alkoxy group, an acyloxy group, or a halogen group, and
the hydrolysis condensate contains an organic group having a salt structure formed between a counter anion derived from the strong acid and a counter cation derived from a primary ammonium group, a secondary ammonium group, or a tertiary ammonium group.