Landscape of Charge Carrier Transport in Doped Poly(3-hexylthiophene): Noncontact Approach Using Ternary Combined Dielectric, Paramagnetic, and Optical Spectroscopies

Yusuke Tsutsui, Haruka Okamoto, Daisuke Sakamaki, Kazunori Sugiyasu, Masayuki Takeuchi, Shu Seki

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We report on a comprehensive measurement system for mobility and energy states of charge carriers in matter under dynamic chemical doping. The temporal evolution of the iodine doping process of poly(3-hexylthiophene) (P3HT) was monitored directly through electron paramagnetic resonance (EPR) and optical absorption spectroscopy, as well as differential electrical conductivity by the microwave conductivity measurement. The increase in conductivity was observed after the EPR intensity reached a maximum and declined thereafter, and the conductivity finally reached ∼80 S cm-1. The carrier species changed from a paramagnetic polaron with an estimated mobility of μP+ ≈ 2 × 10-3 cm2 V-1 s-1 to an antiferromagnetic polaron pair with μPP+ ≈ 0.6 cm2 V-1 s-1. The technique presented here can be a ubiquitous method for rapid and direct observation of charge carrier mobility and energy states in p-type semiconducting materials as a completely noncontact, experimental, and quantitative technique.

Original languageEnglish
Pages (from-to)3639-3645
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume9
Issue number13
DOIs
Publication statusPublished - 2018 Jul 5
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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