A chlorinated polymer promoted analogue co-donors for efficient ternary all-polymer solar cells

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  • ReceivedSep 11, 2018
  • AcceptedOct 16, 2018
  • PublishedNov 9, 2018


The efficient ternary all-polymer solar cells (PSCs) are designed and fabricated, using a polymer acceptor of NDP-V-C7 and analogue co-donors containing a chlorinated polymer PBClT and classical PTB7-Th. PBClT and PTB7-Th possess very similar chemical structure and matched energy levels to form the cascade of the co-donors. Meanwhile, benefiting from those analogous polymer structures, there is little influence of the morphology in blend film compared to their pristine polymer films. The binary PBClT:NDP-V-C7 devices exhibit a high open-circuit voltage (Voc) due to the deep HOMO level of PBClT. The Voc of all-PSCs could be finely manipulated by adjusting the content of PBClT in blend film. The ternary all-PSCs have the more balanced charge mobility and prolonged carrier lifetime compared to the binary devices. The PBClT also help improve the miscibility of ternary blend and suppress crystallization in films, bringing about favorable morphology with appropriate orientation and surface roughness in blend film. With the optimal processing, the champion ternary all-PSCs obtain a high PCE of 9.03%, which is about 10% enhancement compared to that of binary device. The results indicate that the ternary approach using analogue co-donors is a practical method to enhance the performance of all-PSCs.


This work was supported by the SUSTech, the Recruitment Program of Global Youth Experts of China, the National Natural Science Foundation of China (51773087, 21733005), the Natural Science Foundation of Guangdong Province (2016A030313637), Shenzhen Fundamental Research Program (JCYJ20170817111214740) and Shenzhen Nobel Prize Scientists Laboratory Project (C17783101). We also thank Dr. Joseph Strzalka and Dr. Zhang Jiang for the assistance with GIWAXS measurements. Use of the Advanced Photon Source (APS) at the Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under contract No. DE-AC02-06CH11357.

Interest statement

The authors declare that they have no conflict of interest.


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 PTB7-Th, PBClT and NDP-V-C7. (b) Normalized UV-Vis absorptions of PTB7-Th, PBClT and NDP-V-C7 films. (c) The molecular energy levels of PTB7-Th, PBClT and NDP-V-C7 (color online).

  • Figure 2

    (a) J-V and (b) EQE curves of binary and champion ternary all-PSCs (color online).

  • Figure 3

    (a) The PL spectra of neat polymer and blend films; experimental Jsc versus (b) light intensity, (c) normalized TPV and (d) TPC for binary and champion ternary devices, respectively (color online).

  • Figure 4

    DSC traces of NDP-V-C7 and their blend containing binary and ternary (color online).

  • Figure 5

    GIWAXS patterns of (a) PTB7-Th, (b) PBClT and (c) PTB7-Th:PBClT (0.85:0.15) films blending with NDP-V-C7; the related line-cuts in the (d) out-of-plane and (e) in-plane (color online).

  • Table 1   The performance parameters of ternary PSCs with various mass ratios of donors under AM irradiation


    Voc (V)


    (mA cm−2)

























    0.80: 0.20














    14.02± 0.13
















    Average value±standard deviation were calculated from 20 independent devices

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