Get access

Enhanced Charge Transportation in Semiconducting Polymer/Insulating Polymer Composites: The Role of an Interpenetrating Bulk Interface

Authors

  • Guanghao Lu,

    1. State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 (P. R. China)
    2. Graduate School of the Chinese Academy of Sciences Beijing 100049 (P.R. China)
    Search for more papers by this author
  • Haowei Tang,

    1. State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 (P. R. China)
    2. Graduate School of the Chinese Academy of Sciences Beijing 100049 (P.R. China)
    Search for more papers by this author
  • Yan Huan,

    1. State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 (P. R. China)
    Search for more papers by this author
  • Sijun Li,

    1. State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 (P. R. China)
    2. Graduate School of the Chinese Academy of Sciences Beijing 100049 (P.R. China)
    Search for more papers by this author
  • Ligui Li,

    1. State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 (P. R. China)
    2. Graduate School of the Chinese Academy of Sciences Beijing 100049 (P.R. China)
    Search for more papers by this author
  • Yuzhen Wang,

    1. State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 (P. R. China)
    2. Graduate School of the Chinese Academy of Sciences Beijing 100049 (P.R. China)
    Search for more papers by this author
  • Xiaoniu Yang

    Corresponding author
    1. State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 (P. R. China)
    • State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 (P. R. China).
    Search for more papers by this author

Abstract

The charge transportation in poly(3-butylthiophene) (P3BT)/insulating polymer composites is studied both microscopically and macroscopically. The increased mobility of free charge carriers, in particular hole mobility, contributes to the enhanced electrical conductivity of this semiconductor/insulator composite. The conductivity origin of the composite, as revealed by conductive-atomic force microscopy (C-AFM), comes mainly from the P3BT network, whose carrier mobility has been improved as a result of reduced activation energy for charge transportation upon forming an interface with the insulating matrix. Both the huge interfacial area and interconnected conductive component are morphologically required for the enhanced electrical property of the composite. An increased size of the P3BT domains, which correspondingly reduces the interfacial area between the two components, ruins the enhancement. This study clarifies the mechanism of the higher electrical properties achieved in a semiconducting polymer upon blending with an insulating polymer, which will further promote the development of these low-cost, easily processable, and environmentally stable composites.

Get access to the full text of this article

Ancillary