| abstract |
A polymer, a hardmask composition, and a method of forming patterns, the polymer including structural units obtained by a reaction of a reaction mixture that includes a substituted or unsubstituted indole compound, a first aromatic aldehyde compound including a substituted or unsubstituted C3 to C20 branched alkyl group thereon, and a second aromatic aldehyde compound that is different from the first aromatic aldehyde compound. |