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A Fused‐Ring Acceptor Unit in D–A Copolymers Benefits Photovoltaic Performance

2014; Wiley; Volume: 35; Issue: 15 Linguagem: Inglês

10.1002/marc.201400196

1521-3927

Chuantian Zuo, Jiamin Cao, Liming Ding,

Perovskite Materials and Applications

Pentacyclic lactam acceptor unit TPTI invented by our group is proved to be a good building block for efficient D‐A copolymers used in organic solar cells. Here, two D‐A copolymers PBTTPTI and PTTTPTI are developed by copolymerizing TPTI with 2,2′‐bithiophene (BT) or thieno[3,2‐ b ]thiophene (TT). PBTTPTI and PTTTPTI exhibit good solubility and strong interchain π–π interaction even in dilute solution. They possess deep HOMO levels (ca. ‐5.3 eV), partial crystallinity, and good hole mobilities. Blending with PC 71 BM, PBTTPTI and PTTTPTI give decent power conversion efficiencies (PCE) up to 6.83% and 5.86%, with outstanding fill factors (FF) of 74.3% and 71.3%, respectively. image