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SCIENCE CHINA Chemistry, Volume 61 , Issue 10 : 1307-1313(2018) https://doi.org/10.1007/s11426-018-9334-9

A chlorinated low-bandgap small-molecule acceptor for organic solar cells with 14.1% efficiency and low energy loss

More info
  • ReceivedJul 12, 2018
  • AcceptedJul 17, 2018
  • PublishedJul 26, 2018

Abstract

A new acceptor-donor-acceptor (A-D-A) type small-molecule acceptor NCBDT-4Cl using chlorinated end groups is reported. This new-designed molecule demonstrates wide and efficient absorption ability in the range of 600–900 nm with a narrow optical bandgap of 1.40 eV. The device based on PBDB-T-SF:NCBDT-4Cl shows a power conversion efficiency (PCE) of 13.1% without any post-treatment, which represents the best result for all as-cast organic solar cells (OSCs) to date. After device optimizations, the PCE was further enhanced to over 14% with a high short-circuit current density (Jsc) of 22.35 mA cm−2 and a fill-factor (FF) of 74.3%. The improved performance was attributed to the more efficient photo-electron conversion process in the optimal device. To our knowledge, this outstanding efficiency of 14.1% with an energy loss as low as 0.55 eV is among the best results for all single-junction OSCs.


Funded by

the National Natural Science Foundation of China(91633301,51773095)

MoST of China(2014CB643502)

Tianjin city(17JCJQJC44500,17CZDJC31100)

111 Project(B12015)


Acknowledgment

This work was supported by the National Natural Science Foundation of China (91633301, 51773095), MoST of China (2014CB643502), Tianjin city (17JCJQJC44500, 17CZDJC31100) and 111 Project (B12015). The authors also thank beamline BL14B1 (Shanghai Synchrotron Radiation Facility) for providing the beam time.


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

    (a) Chemical structures of PBDB-T-SF and NCBDT-4Cl; (b) normalized absorption spectra of PBDB-T-SF and NCBDT-4Cl neat films; (c) the energy diagrams of PBDB-T-SF and NCBDT-4Cl in the thin-film state calculated from CV results (color online).

  • Scheme 1

    Synthetic route of NCBDT-4Cl.

  • Figure 2

    (a) Current density-voltage (J-V) curves of the as-cast and optimal devices based on PBDB-T-SF:NCBDT-4Cl; (b) the performance histogram of the counts of the as-cast and optimal devices; (c) the EQE curves of the as-cast and optimal devices; (d) Jph versus Veff of the as-cast and optimal devices, respectively (color online).

  • Figure 3

    AFM and TEM images for (a, c) as-cast blend film and (b, d) optimal blend film. The scale bar is 200 nm (color online).

  • Figure 4

    2D-GIXD patterns for (a, b) NCBDT-4Cl and PBDB-T-SF neat films, and (c, d) PBDB-T-SF:NCBDT-4Cl blend films, respectively (color online).

  • Table 1   OSC parameters of the as-cast and optimal devices using the conventional device configuration under the illumination of AM 1.5G and the average data were obtained from 20 devices

    Conditions

    Voc (V)

    Jsc (mA cm−2)

    FF (%)

    PCE (%)

    Eloss (eV)

    As-cast

    0.885 (0.880±0.003)

    20.81 (20.38±0.24)

    70.9 (70.2±0.4)

    13.1 (12.8±0.1)

    0.52

    Optimal a)

    0.851 (0.848±0.003)

    22.35 (22.05±0.18)

    74.3 (74.0±0.2)

    14.1 (13.8±0.2)

    0.55

    0.2% DIO + thermal annealing at 110 °C for 10 min.

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