Journal of Materials Science

, Volume 50, Issue 5, pp 2263–2271 | Cite as

Hydrophilic poly-ether side-chained benzodithiophene-based homopolymer for solar cells and field-effect transistors

  • Qian Liu
  • Xichang Bao
  • Yan Yan
  • Zhengkun Du
  • V. A. L. Roy
  • Dangqiang Zhu
  • Mingliang Sun
  • Chun Sing Lee
  • Renqiang Yang
Original Paper
First Online:
Received:
Accepted:

Abstract

Two benzodithiophene (BDT)-based homopolymers which have different mole ratios of poly-ether side chain substitute were synthesized by Stille coupling reaction. The polymers show decomposition temperature (T d) around 317 °C and optical band gap around 2.2 eV. Solar cell devices with bulk heterojunction structure and field-effect transistors devices were fabricated to evaluate the photovoltaic properties of resultant polymers. Solar cell devices based on the polymer with 100 % poly-ether side chain (P1) show low power conversion efficiencies (PCEs) of 0.71 % resulting from the poor morphology of active layer which has rough surface and fairly large domain size due to the high aggregation tendency of P1:PCBM ([6,6]-phenyl-C61-butyric acid methyl ester) blend thin film as active layer in the structure of devices. Polymer with alternating poly-ether and alkoxy chained BDT (P2) and PCBM blend film shows smooth surface and appropriate domain size, which help to enhance the hole transportation and photovoltaic performances. The PCEs of the devices based on P2 reached 2.00 % which is a decent result for BDT-based homopolymer donor with relatively large band gap (ca. 2.2 eV). These two polymers exhibited mobilities of 3.95 × 10−4 and 6.18 × 10−4 cm2/Vs in field-effect transistors, respectively.

Keywords

High Occupied Molecular Orbital Lower Unoccupied Molecular Orbital External Quantum Efficiency Photovoltaic Performance Polymer Solar Cell 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

Acknowledgements

The authors are deeply grateful to the National Natural Science Foundation of China (Project Nos. 21274134, 51173199, 61107090), New Century Excellent Talents in University (NCET-11-0473), Shandong Provincial Natural Science Foundation (ZR2011BZ007), Qingdao Municipal Science and Technology Program (11-2-4-22-hz, 13-1-4-200-jch) and Shenzhen Municipal Science and Technology Program (JCYJ20130401145617279) for financial support.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Qian Liu
    • 1
    • 2
  • Xichang Bao
    • 1
  • Yan Yan
    • 3
  • Zhengkun Du
    • 1
  • V. A. L. Roy
    • 3
  • Dangqiang Zhu
    • 1
  • Mingliang Sun
    • 2
    • 3
    • 4
  • Chun Sing Lee
    • 3
  • Renqiang Yang
    • 1
  1. 1.CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdaoChina
  2. 2.Institute of Materials Science and EngineeringOcean University of ChinaQingdaoChina
  3. 3.Center of Super-Diamond and Advanced Films (COSDAF)City University of Hong KongKowloon TongHong Kong
  4. 4.Shenzhen Research InstituteCity University of Hong KongShenzhenChina

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