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The effect of end-capping groups in A-D-A type non-fullerene acceptors on device performance of organic solar cells

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Abstract

A series of novel wide bandgap small molecules (IFT-ECA, IFT-M, IFT-TH and IFT-IC) based on the A-D-A structure with indenofluorene core, thiophene bridge, and different electron-deficient end-capping groups, were synthesized and used as non-fullerene acceptors in organic solar cells. The influences of end-capping groups on the device performance were studied. The four materials exhibited different physical and chemical properties due to the variation of end-capping groups, which further affect the exciton dissociation, charge transport, morphology of the bulk-heterojunction films and device performance. Among them, IFT-IC-based device delivered the best power conversion efficiency of 7.16% due to proper nano-scale phase separation morphology and high electron mobility, while the devices based on the other acceptors achieved lower device performance (4.14% for IFT-TH, <1% for IFT-ECA and IFT-M). Our results indicate the importance of choosing suitable electron-withdrawing groups to construct high-performance non-fullerene acceptors based on A-D-A motif.

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Acknowledgments

This work was supported by the Ministry of Science and Technology (2014CB643501), the National Natural Science Foundation of China (21520102006, 21634004, 21490573), and the Guangdong Natural Science Foundation (S2012030006232).

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Correspondence to Chunhui Duan or Fei Huang.

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Jia, J., Zheng, N., Wang, Z. et al. The effect of end-capping groups in A-D-A type non-fullerene acceptors on device performance of organic solar cells. Sci. China Chem. 60, 1458–1467 (2017). https://doi.org/10.1007/s11426-017-9102-1

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