Patent ID: 8426112

Claim:
A resist underlayer film for lithography that is provided between a semiconductor substrate and a resist, the resist underlayer film being formed from a film forming composition that comprises a polymer containing a partial structure of Formula (1): [where X 1 is a group of Formula (2), Formula (3), Formula (4) or Formula (4-1): R 0 is a hydrogen atom, an alkyl group, an aryl group or an alkenyl group, R 1 s are independently a divalent organic group, R 2 s are independently an organic group bonded to a silicon atom through a Si—C bond and having an alkyl group, an aryl group, a halogenated alkyl group, a halogenated aryl group, an alkenyl group, an epoxy group, an acryloyl group, a methacryloyl group, a mercapto group, an amino group or a cyano group, O— is an oxygen-containing group of atoms bonded to a silicon atom through a Si—O bond, R 3 and R 4 are independently a hydrogen atom, a C 1-10 alkyl group, a C 3-6 alkenyl group, a benzyl group or a phenyl group (where, the phenyl group is optionally substituted with a group selected from a group consisting of a C 1-10 alkyl group, a halogen atom, a C 1-10 alkoxy group, a nitro group, a cyano group, a hydroxy group and a C 1-10 alkylthio group), or R 3 and R 4 form together with a carbon atom to which R 3 and R 4 are bonded, a C 3-6 ring, and n, m and p are independently an integer of 0 to 3, with the proviso that when X 1 is a group of Formula (2), Formula (3) or Formula (4-1), 0≦n+m≦5 is satisfied, and when X 1 is a group of Formula (4), 0≦n+m+p≦8 is satisfied]; and a solvent.