3 years ago

A High-Performance D–A Copolymer Based on Dithieno[3,2-b:2′,3′-d]Pyridin-5(4H)-One Unit Compatible with Fullerene and Nonfullerene Acceptors in Solar Cells

A High-Performance D–A Copolymer Based on Dithieno[3,2-b:2′,3′-d]Pyridin-5(4H)-One Unit Compatible with Fullerene and Nonfullerene Acceptors in Solar Cells
Fangyuan Xie, Dan He, Mingwei An, Liming Ding, Zuo Xiao, Xinjian Geng, Zhongli Lei, Jiaxing Jiang, Jianqi Zhang
Development of high-performance donor–acceptor (D–A) copolymers is vital in the research of polymer solar cells (PSCs). In this work, a low-bandgap D–A copolymer based on dithieno[3,2-b:2′,3′-d]pyridin-5(4H)-one unit (DTP), PDTP4TFBT, is developed and used as the donor material for PSCs with PC71BM or ITIC as the acceptor. PDTP4TFBT:PC71BM and PDTP4TFBT:ITIC solar cells give power conversion efficiencies (PCEs) up to 8.75% and 7.58%, respectively. 1,8-Diiodooctane affects film morphology and device performance for fullerene and nonfullerene solar cells. It inhibits the active materials from forming large domains and improves PCE for PDTP4TFBT:PC71BM cells, while it promotes the aggregation and deteriorates performance for PDTP4TFBT:ITIC cells. The ternary-blend cells based on PDTP4TFBT:PC71BM:ITIC (1:1.2:0.3) give a decent PCE of 9.20%. A low-bandgap D–A copolymer based on dithieno[3,2-b:2′,3′-d]pyridin-5(4H)-one unit, PDTP4TFBT, is developed and used as the donor material for polymer solar cells. PDTP4TFBT is among a few D–A copolymers that can deliver >7% power conversion efficiencies (PCEs) in both fullerene and nonfullerene solar cells. Ternary-blend solar cells based on PDTP4TFBT, PC71BM, and ITIC give a PCE of 9.20%.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201602509

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