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Star molecules have many advantages, such as monodispersity, excellent solubility, and vast structures with different functional groups. A set of four-arm star molecules with benzothiadiazole as the core, oligothiophene as the arm, and triphenylamine as the end group and their linear counterparts were designed and synthesized. Organic solar cells (OSCs) fabricated with these star molecules and 6,6-phenyl C 71 butyric acid methyl ester (PC 71 BM) by spin-coating from solution demonstrate similar short circuit current density ( J sc ) and fill factor (FF) but larger open circuit voltage ( V oc ) in comparison with solar cells fabricated with corresponding linear molecules and PC 71 BM. A power conversion efficiency (PCE) of 1.8%, with J sc = 4.9 mA/cm 2, V oc = 0.92 V, and FF = 0.41 was achieved with one of these star molecules.
Li et al. (Mon,) studied this question.