Polymer, organic layer composition, organic layer, and method of forming patterns

An organic layer 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 cyclic group selected from Group 2:
• wherein, in Group 2,
• Z1 and Z12 are O, S, Te, or Se,
• Z2, Z5, Z6, and Z9 are NRa, O, S, Te, or Se,
• Z3 to Z4, Z7 to Z8, Z10 to Z11 and Z13 to Z23 are N, and
• Ra is hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C3 to C30 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C7 to C30 arylalkyl group, a substituted or unsubstituted C1 to C30 heteroalkyl group, a substituted or unsubstituted C2 to C30 heterocycloalkyl group, a substituted or unsubstituted C2 to C30 heterocyclic group, a substituted or unsubstituted C2 to C30 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, a hydroxy group, a halogen atom or a combination thereof,
• wherein in Group 2, a location of linking points is not limited,
• B is one of groups in Group 1, and
• * is a linking point,
• wherein, in Group 1,
• Ar1 to Ar4 are each independently a substituted or unsubstituted C6 to C30 aryl group,
• R11 to R14 are each independently a hydroxy group, a thionyl group, a thiol group, a cyano group, a substituted or unsubstituted amino group, a halogen atom, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted C3 to C30 cycloalkenyl group, a substituted or unsubstituted C1 to C20 alkylamine group, a substituted or unsubstituted C7 to C20 arylalkyl group, a substituted or unsubstituted C1 to C20 heteroalkyl group, a substituted or unsubstituted C2 to C30 heterocycloalkyl group, a substituted or unsubstituted C2 to C30 heteroaryl group, a substituted or unsubstituted C1 to C4 alkylether group, a substituted or unsubstituted C7 to C20 arylalkylene ether group, a substituted or unsubstituted C1 to C30 haloalkyl group, or a combination thereof, g to j are each independently an integer ranging from 0 to 2,
• L is a single bond, a substituted or unsubstituted C1 to C6 alkylene group, a substituted or unsubstituted C6 to C30 arylene group, or a combination thereof,
• m is an integer ranging from 1 to 3, and
• * is a linking point.