2D coherent charge transport in highly ordered conducting polymers doped by solid state diffusion

Keehoon Kang, Shun Watanabe, Katharina Broch, Alessandro Sepe, Adam Brown, Iyad Nasrallah, Mark Nikolka, Zhuping Fei, Martin Heeney, Daisuke Matsumoto, Kazuhiro Marumoto, Hisaaki Tanaka, Shin Ichi Kuroda, Henning Sirringhaus

Research output: Contribution to journalArticlepeer-review

187 Citations (Scopus)

Abstract

Doping is one of the most important methods to control charge carrier concentration in semiconductors. Ideally, the introduction of dopants should not perturb the ordered microstructure of the semiconducting host. In some systems, such as modulation-doped inorganic semiconductors or molecular charge transfer crystals, this can be achieved by spatially separating the dopants from the charge transport pathways. However, in conducting polymers, dopants tend to be randomly distributed within the conjugated polymer, and as a result the transport properties are strongly affected by the resulting structural and electronic disorder. Here, we show that in the highly ordered lamellar microstructure of a regioregular thiophene-based conjugated polymer, a small-molecule p-type dopant can be incorporated by solid state diffusion into the layers of solubilizing side chains without disrupting the conjugated layers. In contrast to more disordered systems, this allows us to observe coherent, free-electron-like charge transport properties, including a nearly ideal Hall effect in a wide temperature range, a positive magnetoconductance due to weak localization and the Pauli paramagnetic spin susceptibility.

Original languageEnglish
Pages (from-to)896-902
Number of pages7
JournalNature materials
Volume15
Issue number8
DOIs
Publication statusPublished - 2016 Aug 1

Bibliographical note

Publisher Copyright:
© 2016 Macmillan Publishers Limited. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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