Replacing Alkoxy Groups with Alkylthienyl Groups: A Feasible Approach To Improve the Properties of Photovoltaic Polymers

Authors

  • Dr. Lijun Huo,

    1. State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)
    Search for more papers by this author
  • Shaoqing Zhang,

    1. State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)
    Search for more papers by this author
  • Xia Guo,

    1. CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)
    Search for more papers by this author
  • Feng Xu,

    1. State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)
    Search for more papers by this author
  • Prof. Yongfang Li,

    Corresponding author
    1. CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)
    • CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)
    Search for more papers by this author
  • Prof. Jianhui Hou

    Corresponding author
    1. State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)
    • State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)
    Search for more papers by this author

  • This work was supported by the National High Technology Research and Development Program 863 (No. 2011AA050523), Solarmer Energy Inc, NSFC (Nos. 20874106, 50933003, 21021091, and 20821120293) and the Chinese Academy of Sciences. We thank Prof. Wenping Hu and Dr. Lang Jiang for their help on the hole mobility measurements using field-effect transistors.

Abstract

original image

Another dimension: Two newly designed two-dimensional (2D) conjugated polymers, PBDTTT-E-T (see scheme; left) and PBDTTT-C-T, were prepared and their properties compared to those of the alkoxy-substituted analogues (right). PBDTTT-E-T and PBDTTT-C-T exhibited smaller band gaps, lower-energy HOMO levels, better thermal stabilities, and much better photovoltaic properties. Therefore, the 2D structures are feasible for the design of photovoltaic polymers.

Ancillary