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A non-fullerene acceptor based on alkylphenyl substituted benzodithiophene for high efficiency polymer solar cells with a small voltage loss and excellent stability

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Abstract

In this work, a new non-fullerene small molecule acceptor (NF-SMA) named BP-4F, based on benzo[1,2-b:4,5-b′]di(cyclopenta[2,1-b:3,4-b′]dithiophene) with 4-(2-ethylhexyl)phenyl conjugated side chains (BDTP) as an electron-donating core, flanked with a strong electron-withdrawing 2-(5,6-difluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)-malononitrile (2FIC) unit, is designed and synthesized for polymer solar cell applications. BP-4F exhibits strong absorption in the 550 to 830 nm region with a narrow optical band gap of 1.49 eV, suitable energy levels with a lowest unoccupied molecular orbital (LUMO) of −3.90 eV and an effective electron mobility of 2.10 × 10−4 cm2 V−1 s−1. When blended with the wide bandgap polymer PM6 as the active layer, the polymer solar cells (PSCs) achieve an average power conversion efficiency (PCE) of 13.9% with an energy loss (Eloss) as low as 0.59 eV, which is of benefit to overcome the trade-off between Jsc and Voc. Furthermore, the BP-4F-based PSCs achieve an excellent PCE of 12.3% with a device area of 1.10 cm2. Notably, the devices show an excellent storage stability and photo-stability by retaining nearly 90% of the initial PCE in air under dark conditions and 93.5% in a glovebox under continuous illumination for 720 hours, respectively. These results indicate that BP-4F is an effective electron acceptor for high efficiency and stable polymer solar cells.

Graphical abstract: A non-fullerene acceptor based on alkylphenyl substituted benzodithiophene for high efficiency polymer solar cells with a small voltage loss and excellent stability

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Publication details

The article was received on 07 Aug 2019, accepted on 16 Sep 2019 and first published on 17 Sep 2019


Article type: Paper
DOI: 10.1039/C9TA08636F
J. Mater. Chem. A, 2019, Advance Article

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    A non-fullerene acceptor based on alkylphenyl substituted benzodithiophene for high efficiency polymer solar cells with a small voltage loss and excellent stability

    Q. Guo, X. Zhu, X. Dong, Q. Zhu, J. Fang, X. Guo, W. Ma, M. Zhang and Y. Li, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA08636F

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