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17.1%-Efficiency organic photovoltaic cell enabled with two higher-LUMO-level acceptor guests as the quaternary strategy

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  • ReceivedDec 9, 2019
  • AcceptedDec 20, 2019
  • PublishedMar 11, 2020

Abstract


Funded by

the National Natural Science Foundation of China(91433202,21773262,21327805)


Acknowledgment

This work was supported by the National Natural Science Foundation of China (91433202, 21773262, 21327805) and Taishan Scholars Program of Shandong Province (tsqn201812101).


Interest statement

The authors declare that they have no conflict of interest.


Supplement

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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  • Figure 1

    Molecular structures of the donor polymer and the host and guest acceptors (color online).

  • Figure 2

    Film absorption spectra (a) and energy levels (b) of donor polymer and the host (Y6) and guest (IDIC and PC71BM) acceptors. The energy levels of PM6 and the host and guest acceptors were measured under the same experimental conditions [7,12] (color online).

  • Figure 3

    The J-V curve (a) and EQE spectrum (b) of the optimized quaternary device. The insert in (a) is the histogram of the PCEs of the quaternary solar cells (color online).

  • Figure 4

    (a) The illuminated J-V curves of the quaternary solar cells fabricated under different acceptor ratios. (b–e) The plots of the photovoltaic parameters (b), of the hole and electron mobilities (c), of the Jph,sc and Jph,sat (d), and of the values α, n, Rs and Rsh (e) versus the compositions of the three acceptor materials. (f) The dark J-V curves of the quaternary solar cells fabricated under different acceptor ratios (color online).

  • Figure 5

    Photo-fluorescence (PL) spectra of the pure donor polymer and the host and guest acceptor films (a) and binary, ternary and quaternary blended films (b) (color online).

  • Figure 6

    (a, b) fs-TA spectra of neat Y6 and PM6:Y6:IDIC:PC71BM (1:1.0:0.2:0.1) quaternary blends obtained under excitation with 832 nm wavelength light. (c, d) Comparison of the the kinetic and fitting curves at 600 nm for the binary, ternary and quaternary blends (color online).

  • Figure 7

    The TEM (a–f) and AFM height (g–l) and phase (m–r) images of the quaternary solar cell blend films fabricated under different acceptor ratios: PM6:Y6:IDIC:PC71BM=1:1:0:0.3 (a, g, m), 1:1:0.1:0.2 (b, h, n), 1:1:0.2:0.1 (c, i, o), 1:1.1:0.2:0.1 (d, j, p), 1:1.2:0.2:0.1 (e, k, q), and 1:1:0.3:0 (f, l, r) (color online).

  • Table 1   The photovoltaic data with different electron-acceptor materials. The electron-donor material is PM6 for all PSCs. All data were obtained under illumination of AM 1.5G light source

    PM6:Y6:IDIC:PC71BM

    Voca) (V)

    Jsc a) (mA/cm2)

    FF a)

    PCEave a) (%)

    1:1.0:0:0

    0.838

    25.45

    72.33

    15.46

    1:1.0:0:0.3

    0.851 (0.850±0.001)

    25.28 (25.01±0.31)

    75.15 (74.86±0.35)

    16.16 (16.01±0.18)

    1:1.0:0.1:0.2

    0.866 (0.865±0.001)

    25.61 (25.18±0.57)

    74.72 (74.31±0.45)

    16.57 (16.41±0.22)

    1:1.0:0.2:0.1

    0.866 (0.865±0.001)

    26.19 (25.91±0.31)

    75.29 (74.99±0.31)

    17.07 (16.98±0.11)

    1:1.1:0.2:0.1

    0.867 (0.866±0.001)

    25.88 (25.67±0.28)

    74.15 (73.82±0.38)

    16.64 (16.49±0.19)

    1:1.2:0.2:0.1

    0.868 (0.867±0.001)

    25.12 (24.96±0.23)

    75.02 (74.76±0.34)

    16.34 (16.21±0.15)

    1:1.0:0.3:0

    0.869 (0.867±0.002)

    24.55 (24.31±0.26)

    75.59 (75.11±0.52)

    16.13 (16.04±0.14)

    1:0:1.0:0b)

    0.924

    10.81

    71.6

    7.13

    1:0:0:1.0c)

    0.911

    13.4

    65.1

    8.00

    Average values from 20 devices shown in parentheses. b) Data from ref. [7]. c) Data from ref. [12].

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