Patent ID: 8361694

Claim:
A resist underlayer film forming composition comprising: a mixture of fullerene derivatives represented by Formula (1): wherein R 1 represents an aryl group which optionally has a substituent, R 2 represents an ester group (—COOR 3 where, R 3 represents an alkyl group) or an alkyl group which optionally has a substituent, and n represents an integer of 2 and 3, respectively; and/or a mixture of fullerene derivatives represented by Formula (2): wherein R 1 represents an aryl group which optionally has a substituent, R 2 represents an ester group (—COOR 3 where, R 3 represents an alkyl group) or an alkyl group which optionally has a substituent, and n represents an integer of 2 and 3, respectively; a polymer; a crosslinking agent, the mass ratio of the crosslinking agent relative to the polymer satisfying a range of (10 to 40)/100; a catalyst that accelerates the crosslinking reaction, the mass ratio of the catalyst relative to the polymer satisfying a range of (1 to 4)/100; and an organic solvent.