Control of molecular doping in conjugated polymers by thermal annealing

Ryo Fujimoto, Shun Watanabe, Yu Yamashita, Junto Tsurumi, Hiroyuki Matsui, Tomokatsu Kushida, Chikahiko Mitsui, Hee Taek Yi, Vitaly Podzorov, Jun Takeya

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Doping is one of the most fundamental building blocks for semiconductor processing, and enables adaptation to both charge concentration and electrical conductivity. Despite attempts to investigate various doping and de-doping methods for organic semiconductors over many years, their use has been limited to date. Here, we present a method to precisely control the degree of doping in dopant-implanted thiophene-based polymeric conductors. A simple post annealing at a relatively low temperature of approximately 110 °C can significantly diminish the charge carrier concentration with precision, where the controllability is evaluated comprehensively using electron spin resonance and optical absorption techniques. At higher doping regimes, a band-like charge transport with an ideal Hall effect and weak localization is confirmed.

Original languageEnglish (US)
Pages (from-to)139-146
Number of pages8
JournalOrganic Electronics
StatePublished - Aug 1 2017

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Biomaterials


  • Doping
  • Hall effect
  • Organic semiconductors


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