Hardmask composition, hardmask layer and method of forming patterns

A hardmask composition, comprising:

• a polymer including a structural unit represented by Chemical Formula 1;
• and
• a solvent:
• wherein, in Chemical Formula 1,
• A is a substituted or unsubstituted aromatic group, a substituted or unsubstituted heteroaromatic group, a group in which two or more substituted or unsubstituted aromatic groups or substituted or unsubstituted heteroaromatic groups are linked by a single bond or —CRxRy—, in which Rx and Ry are each independently a substituted or unsubstituted aromatic group or a substituted or unsubstituted heteroaromatic group, Rx and Ry being separate or linked to form a fused ring, or a combination thereof,
• B is a group represented by Chemical Formula 2, and
• * is a linking point:
• wherein, in Chemical Formula 2,
• X1 and X2 are each independently a substituted or unsubstituted C1 to C20 saturated or unsaturated aliphatic hydrocarbon group, a substituted or unsubstituted C3 to C20 saturated or unsaturated alicyclic hydrocarbon group, a substituted or unsubstituted C1 to C20 saturated or unsaturated heteroaliphatic hydrocarbon group, a substituted or unsubstituted C2 to C20 saturated or unsaturated heteroalicyclic hydrocarbon group, a substituted or unsubstituted C6 to C30 aromatic group, a substituted or unsubstituted C6 to C30 heteroaromatic group, or a combination thereof, X1 and X2 being separate or being linked to each other to form a substituted or unsubstituted C3 to C30 hydrocarbon ring group,
• R1 to R4 are each independently deuterium, a hydroxy group, a halogen atom, —NRaRb, in which Ra and Rb are each independently hydrogen or a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, a substituted or unsubstituted C3 to C20 cycloalkyl group, a substituted or unsubstituted C3 to C20 cycloalkenyl group, a substituted or unsubstituted C3 to C20 cycloalkynyl group, a substituted or unsubstituted C3 to C20 hetero cycloalkyl group, a substituted or unsubstituted C6 to C20 aryl group, a substituted or unsubstituted C6 to C20 heteroaryl group, or a combination thereof,
• m1 to m4 are each independently an integer of 0 to 4, and
• n1 and n2 are each independently an integer of 1 to 4.