Monomer, polymer, organic layer composition, organic layer, and method of forming patterns

A monomer having Chemical Formula 1:

• wherein, in Chemical Formula 1,
• A1, A2, A3, A4, and A5 are each independently a substituted or unsubstituted aromatic ring group,
• X1, X2, X3, and X4 are each independently a hydroxy 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 alkyl ether group, a substituted or unsubstituted C7 to C20 arylalkylene ether group, a substituted or unsubstituted C1 to C30 haloalkyl group, or a combination thereof,
• C1, C2, C3, C4, D1, D2, D3, D4, E1, E2, E3, and E4 are each independently a hydrogen atom, a hydroxy 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 alkyl ether group, a substituted or unsubstituted C7 to C20 arylalkylene ether group, a substituted or unsubstituted C1 to C30 haloalkyl group, or a combination thereof, and
• a and b are each independently 0 or 1, and c is 1, and
• wherein:
• at least one of C1, D1 and E1 is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a combination thereof, and
• at least one of C2, D2 and E2 is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a combination thereof, and
• at least one of A1, A2 and A3 is an aromatic ring group independently substituted with 1 or more methoxy groups or ethoxy groups.