期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 8, 页码 9545-9554出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b22987
关键词
polymer solar cells; fluorination; nitrogenation; large band gap; bulk-heterojunction
资金
- National Natural Science Foundation of China [21671071, 21805097, 51521002]
- Guangdong Applied Science and Technology Planning Project [2017B090917002, 2015B010135009]
- Guangdong Natural Science Foundation [2016A030310428]
- Guangzhou Science and Technology Foundation [201904010361]
State-of-the-art non-fullerene bulk-heterojunction (BHJ) polymer solar cells outperform the more extensively studied polymer-fullerene BHJ solar cells in terms of efficiency, thermal-, and photostability. Considering the strong light absorption in the near-infrared region (600-1000 nm) for most of the efficient acceptors, the exploration of high-performing large band gap (LBG) polymer donors with complementary optical absorption ranging from 400 to 700 nm remains critical. In this work, the strategy of concurrently incorporating fluorine (-F) and unsaturated nitrogen (-N) substituents along the polymer backbones is used to develop the LBG polymer donor PB[N][F]. Results show that the F- and N-substituted polymer donor PB[N][F] realizes up to 14.4% efficiency in BHJ photovoltaic devices when paired with a benchmark molecule acceptor Y6, which largely outperforms the analogues PB with an efficiency of only 3.6% and PB[N] with an efficiency of 11.8%. Systematic examinations show that synergistic effects of polymer backbone fluorination and nitrogenation can significantly increase ionization potential values, improve charge transport, and reduce bimolecular recombination and trap-assisted recombination in the PB[N][F]:Y6 BHJ system. Importantly, our study shows that the F- and N-substituted conjugated polymers are promising electron-donor materials for solution-processed non-fullerene BHJ solar cells.
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