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SCIENCE CHINA Materials, Volume 60, Issue 9: 819-828(2017) https://doi.org/10.1007/s40843-017-9084-x

Design and synthesis of low band gap non-fullerene acceptors for organic solar cells with impressively high Jsc over 21 mA cm−2

More info
  • ReceivedJun 26, 2017
  • AcceptedJul 24, 2017
  • PublishedAug 29, 2017

Abstract

Three low bandgap non-fullerene acceptors based on thieno[3,2-b]thiophene fused core with different ending groups, named TTIC-M, TTIC, TTIC-F were designed and synthesized. Using a wide bandgap polymer PBDB-T as donor to form a complementary absorption in the range of 300–900 nm, high efficencies of 9.97%, 10.87% and 9.51% were achieved for TTIC-M, TTIC and TTFC-F based photovoltaic devices with impressively high short circuit current over 21 mA cm−2.


Funded by

work was supported by the Minstry of Science and Technology(2014CB643502)

National Natural Science Foundation of China(91633301,51422304,91433101)

PCSIRT(IRT1257)

Tianjin city(17JCZDJC31100)


Acknowledgment

The work was supported by the Minstry of Science and Technology (2014CB643502), the National Natural Science Foundation of China (91633301, 51422304 and 91433101), PCSIRT (IRT1257) and Tianjin city (17JCZDJC31100).


Interest statement

The authors declare that they have no conflict of interest.


Contributions statement

Gao HH, Wan X, Chen Y and Kan B designed the project. Wan X, Li C and Chen Y directed the research. Sun Y, Wan X and Zhang H fabricated and characterized the devices, Ke X finished the DFT calculation. Gao HH wrote the paper, with support from Chen Y. All authors contributed to the general discussion.


Author information

Huan-Huan Gao is a PhD candidate under the supervision of Prof. Yongsheng Chen and Wan Xiangjian at Nankai University. She received her bachelor's degree in chemistry from Nanyang Normal University in 2013 and master’s degree in organic chemistry from Nankai University in 2016. Her research focuses on the design and synthesis of organic photovoltaic materials.


Xiangjian Wan received his PhD degree in organic chemistry from Nankai University, China, in 2006. Currently, he is a professor at Nankai University. His research interests focus on the organic functional materials design and application, especially on the solution processed small molecule OPV materials and device optimization.


Yongsheng Chen received his PhD in chemistry at the University of Victoria in 1997. From 2003, he has been a Chair Professor at Nankai University. His main research interests focus on carbon-based nanomaterials and organic functional materials for green energy applications.


Supplement

Supplementary information

Supporting data are available in the online version of the paper.


References

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  • Figure 1

    Chemical structure of PBDB-T and three non-fullerene acceptors.

  • Scheme 1

    The synthetic routes of TTIC-M, TTIC and TTIC-F.

  • Figure 2

    UV-vis spectra of TTIC-M, TTIC and TTIC-F in the dilute chloroform solution (a) and thin films.

  • Figure 3

    PL spectra of PBDB-T, TTIC-M, TTIC, TTIC-F and the blend films of PBDB-T and TTIC derivatives.

  • Figure 4

    CVs of TTIC-M, TTIC and TTIC-F in dichloromethane (a) and the corresponding energy levels (b).

  • Figure 5

    The geometry and the HOMOs, LUMOs distribution by DFT calculations.

  • Figure 6

    The J-V curves based on PBDB-T/TTIC-M, TTIC and TTIC-F with SVA for 90 s (a) and the corresponding EQE spectra (b).

  • Figure 7

    The hole (a) and electron (b) mobilities.

  • Figure 8

    The AFM images of the blend films PBDB-T/TTIC-M (a), TTIC (b) and TTIC-F (c) with SVA for 90 s and the TEM images below (d, e, f).

  • Table 1   Summay of the photophysical and electronic data of , and

    Compound

    λmaxsol (nm)

    λmaxfilm (nm)

    λedgefilm (nm)

    Egopt (eV)

    HOMO (eV)

    LUMO (eV)

    Egcv (eV)

    TTIC-M

    746

    783

    863

    1.44

    −5.30

    −3.82

    1.48

    TTIC

    750

    820

    900

    1.38

    −5.33

    −3.87

    1.46

    TTIC-F

    756

    828

    916

    1.35

    −5.34

    −3.88

    1.46

  • Table 2   Photovoltaic parameters of the BHJ solar cells based on and the three non-fullerene acceptors

    Compound

    Voc (V)

    JscJ-V (mA cm−2)

    JscEQE (mA cm−2)

    FF

    PCEc (%)

    TTIC-M

    0.83a

    18.36a

    0.56a

    8.39 ± 0.14 (8.53)a

    0.83b

    19.07b

    17.58

    0.63b

    9.85 ± 0.12 (9.97)b

    TTIC

    0.81a

    18.78a

    0.63a

    9.41 ± 0.17 (9.58)a

    0.80b

    20.58b

    19.37

    0.66b

    10.73 ± 0.14 (10.87)b

    TTIC-F

    0.72a

    19.11a

    0.59a

    7.92 ± 0.16 (8.08)a

    0.71b

    21.26b

    19.31

    0.63b

    9.38 ± 0.13 (9.51)b

    The devices without post process. b) SVA for 90 s. c) The PCE values were measured from 30 devices and the highest PCE were in parentheses.

  • Table 3   The mobility of , and devices after SVA for

    Compound

    μh (10−4 cm−2 V−1 s−1)

    μe (10−4 cm−2 V−1 s−1)

    μh/μe

    TTIC-M

    0.87

    0.86

    1.01

    TTIC

    1.63

    1.61

    1.01

    TTIC-F

    1.29

    1.38

    0.93

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