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A novel 2D benzodifuran (BDF)‐based copolymer (PBDF‐T1) is synthesized. Polymer solar cells fabricated with PBDF‐T1 show high power conversion efficiency of 9.43% and fill factor of 77.4%, which is higher than the performance of its benzothiophene (BDT) counterpart (PBDT‐T1). These results provide important progress for BDF‐based copolymers and demonstrate that BDF‐based copolymers can be competitive...
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