SCIENCE CHINA Chemistry, Volume 64 , Issue 7 : 1192-1199(2021) https://doi.org/10.1007/s11426-021-1013-0

High-performance polymer solar cells with efficiency over 18% enabled by asymmetric side chain engineering of non-fullerene acceptors

More info
  • ReceivedApr 2, 2021
  • AcceptedApr 20, 2021
  • PublishedMay 20, 2021


Funded by

the National Key Research and Development Program of China(2019YFA0705900)

and the Basic and Applied Basic Research Major Program of Guangdong Province(2019B030302007)


The work was supported by the National Key Research and Development Program of China (2019YFA0705900) funded by MOST, and the Basic and Applied Basic Research Major Program of Guangdong Province (2019B030302007).

Interest statement

The authors declare no conflict of interest.

Contributions statement

These authors contributed equally to this work.


Supporting information

The supporting information is available online at http://chem.scichina.com and http://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.


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  • Scheme 1

    Chemical structures of acceptors, donor and interface layer materials (color online).

  • Figure 1

    (a) DSC characteristics of NFSMAs; (b) UV-Vis-NIR absorption spectra of NFSMAs in chloroform solution; (c) normalized UV-Vis-NIR absorption spectra of pristine NFSMAs and PM6 films; (d) energy diagrams of active-layer materials; (e) J-V characteristics and (f) EQE spectra of the optimal NFPSCs (color online).

  • Figure 2

    (a) Jph-Veff relationships of PM6:acceptors-based devices; (b) JSC versus Plight curves of PM6:acceptors devices; (c) VOC versusPlight cures of PSCs based on PM6:acceptors (color online).

  • Figure 3

    Film morphology images. AFM height images (a–c) and TEM images (d–f) of BO-4F, EH-HD-4F and Bu-OD-4F blend films (color online).

  • Figure 4

    2D GIWAXS patterns of (a) PM6:EH-HD-4F, (b) PM6:BO-4F and (c) PM6:Bu-OD-4F; and (d) integrated scattering profiles for the corresponding blend films (color online).

  • Figure 5

    Stability tests of PM6:EH-HD-4F- and PM6:Y6-based NFPSCs with 2PACz and PEDOT:PSS under illumination with light intensity of 100 mW cm−2 (color online).

  • Table 1   Optical, thermal and electrochemical properties of EH-HD-4F, BO-4F and Bu-OD-4F


    λmax (nm)

    λonset (nm)

    Egopt (eV) a)

    EHOMO (eV) b)

    ELUMO (eV) b)

    Tm (°C)

    ∆Hm (J g−1)

    In solution






























    Calculated from the absorption onsets of acceptors; Egopt=1240/λonset; (b) calculated according to EHOMO=−e(Eox−0.43+4.80) eV and ELUMO=−e(Ered−0.43+4.80) eV, respectively.

  • Table 2   Photovoltaic parameters of the optimized solar cells based on EH-HD-4F, BO-4F and Bu-OD-4F under standard AM 1.5G illumination, 100 mW cm−2


    VOC (V)

    JSC (mA cm−2)

    FF (%)

    PCE (%) a)

    PCEmax (%)







    EH-HD-4F b)












    BO-4F b)












    Bu-OD-4F b)






    Average of 8 individual devices; (b) PSCs based on PEDOT:PSS.


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