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Motivated by simplifying the synthesis of nonfullerene acceptor and establishing the relation between molecular structure and photovoltaic performance, two isomeric nonfused ring electron acceptors (o‐TT‐Cl and m‐TT‐Cl), whose properties can be adjusted by changing the side chains, are designed and synthesized with several high‐yield steps. o‐TT‐Cl with V‐shaped side chain induces a dominated J‐aggregation...