Optical measurement of doping efficiency in poly(3-hexylthiophene) solutions and thin films

Chenchen Wang, Duc T. Duong, Koen Vandewal, Jonathan Rivnay, Alberto Salleo

Research output: Contribution to journalArticlepeer-review

81 Scopus citations

Abstract

The doping mechanism of 2,3,5,6-tetrafluoro-7,7,8,8,-tetracyanoquinodimethane (F4TCNQ) doped poly(3-hexylthiophene) (P3HT) thin films and solutions is studied by UV-visible and IR absorption spectral analysis. We show that integer charge transfer between the two molecules is observed in this system with 63% of the dopants producing a fully transferred charge in thin film. The primary P3HT doped species in solution and thin film are shown to be bipolarons and polarons, respectively. The absorption signatures of polarons and bipolarons are identified and their cross sections are measured, which can be used to evaluate the influence of processing conditions on the density of impurity dopant-induced polarons in nominally "neat" P3HT films.

Original languageEnglish (US)
Article number085205
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number8
DOIs
StatePublished - Feb 17 2015

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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