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Science China Chemistry

, Volume 61, Issue 12, pp 1609–1618 | Cite as

High-efficiency quaternary polymer solar cells enabled with binary fullerene additives to reduce nonfullerene acceptor optical band gap and improve carriers transport

  • Weiping Li
  • Dong Yan
  • Feng LiuEmail author
  • Thomas Russell
  • Chuanlang ZhanEmail author
  • Jiannian YaoEmail author
Articles

Abstract

The polymer/small-molecule electron donor and nonfullerene organic electron acceptor are of structural similarity with both donor and acceptor molecules consisting of polycyclic fused-ring backbone and being decorated with alkyl-chains. In this study, we report that the introduction of binary fullerenes (C60-/C70-PCBM and C60-/C70-ICBA) into a nonfullerene binary system PBDB-T:ITIC reduces the polymer-nonfullerene acceptor intermixing, obtaining higher crystallinity with (100) crystal coherence length from 28 to 29–33 nm for the ITIC, and from 14 to 20–24 nm for the PBDB-T, and improved electron and hole mobilities both. Unprecedentedly, such a protocol reduces the ITIC optical band gap from 1.59 to 1.55 eV. As consequences, higher short-circuit current-density (17.8–18.4 vs. 15.8 mA/cm2), open-circuit voltage (0.92 vs. 0.90 V) and fill-factor (0.72–0.73 vs. 0.68) are simultaneously obtained, which ultimately afford higher efficient quaternary polymer solar cells with power conversion efficiencies (PCEs) up to 12.0%–12.8% comparing to the host binary device with 9.9% efficiency. For the polymer, ITIC, and ICBA/PCBM ternary blends, 11% PCEs were recorded. The use of PCBM leads to larger red-shifting in thin film absorption and external quantum efficiency (EQE) response. Such effect is more pronounced when ICBA:PCBM mixture is used. These results indicate the size and shape of C60 and C70 as well as the substituent position of the second indene unit on C60-/C70-ICBA affect not only the blend morphology but also the electronic coupling in BHJ mixtures: the quaternary device performance increased in sequences of C70-PCBM:C70-ICBA→C70-PCBM:C60-ICBA→C60-PCBM:C70-ICBA→C60-PCBM: C60-ICBA. The resonant soft X-ray scattering (RSoXS) data indicated the most refined phase separation in the C60-PCBM:C60-ICBA based blend, corresponding to its best device function among the quaternary devices. These results indicate that the using of binary fullerenes as the acceptor additives allows for tuning nonfullerene blended film’s optical properties and film-morphologies, shedding light on the designing high-performance multi-acceptor polymer solar cells.

Keywords

quaternary bulk-heterojunction polymer solar cell nonfullerene acceptor fullerene-free fullerene 

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Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (91433202, 21773262, 21327805, 21521062, 91227112), Chinese Academy of Sciences (XDB12010200), Ministry of Science and Technology of China (2013CB933503), and the US Office of Naval Research (N00014-15-1-2244). Parts of this research were conducted at beamline 7.3.3 and 11.0.1.2, and Molecular Foundry at Lawrence Berkeley National Laboratory, which was sustained by the Department of Energy, Office of Science, and Office of Basic Energy Sciences

Supplementary material

11426_2018_9320_MOESM1_ESM.pdf (1.1 mb)
High-Efficiency Quaternary Polymer Solar Cells Enabled with Binary Fullerene Additives to Reduce Nonfullerene Acceptor Optical Band Gap and Improve Carriers Transport

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, Institute of ChemistryChinese Academy of SciencesBeijingChina
  2. 2.Department of Physics and Astronomy, and Collaborative Innovation Center of IFSA (CICIFSA)Shanghai Jiaotong UniversityShanghaiChina
  3. 3.Department of Polymer Science and Engineering, Room A516, Conte Research CenterUniversity of Massachusetts AmherstAmherstUSA
  4. 4.University of Chinese Academy of SciencesBeijingChina

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