Patent ID: 8163460

Claim:
An underlayer coating forming composition for lithography that is used in a lithography process of manufacture of semiconductor device, comprising: a polysilane compound having: structural units of formulae (1) and (2): where: X is a C 1-10 alkyl, C 1-10 alkoxy, C 7-15 aralkyl, C 6-14 aryl, C 7-15 aryloxyalkyl, hydroxy, C 2-10 alkenyl, or C 2-10 alkoxyalkyl group; m is an integer of 1 to 5, and when m is 2 to 5, the Xs are identical to or different from each other; n 1 and n 2 are numbers of repeating units where n 1 and n 2 are integers of 1 or more, and n 1 +n 2 is 40 to 200; R 1 is a hydrogen atom or a C 1-10 alkyl; R 2 is a hydrogen atom or a C 1-10 alkyl; and A is a C 1-10 alkylene, or a structural unit of formula (3): where: n 1 is a number of repeating units ranging from 40 to 200; and R 3 is substituted or unsubstituted cycloalkyl, or a combination of substituted or unsubstituted C 1-10 alkyl and substituted or unsubstituted cycloalkyl, wherein the substituted or unsubstituted cycloalkyl is present in a proportion of 20 mol % or more in all of R 3 , a crosslinkable compound that is a nitrogen-containing compound having two or more nitrogen atoms substituted with hydroxymethyl or alkoxymethyl, a crosslinking catalyst, and a solvent.