Electron spin resonance and electrical transport in films of poly (3,4-ethylenedioxythiophene) doped with poly(styrenesulphonate)

Jung Keun Lee, Seunghun You, Sunam Jeon, Na Hyun Ryu, Ki Hun Park, Kim Myung-Hoon, Dong Hun Kim, Sun Hee Kim, Eric Allan Schiff

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5 Scopus citations

Abstract

We report electron spin resonance (ESR) and electrical transport measurements in pristine poly(3,4-ethylenedioxythiophene) doped with poly(styrenesulphonate) (PEDOT:PSS) films and ethylene glycol (EG)-treated PEDOT:PSS films. Based on the assumption that ESR from PEDOT:PSS is mainly due to hole polarons, we estimated the polaron mobility in the PEDOT:PSS films as μ p ≈ 0.1 - 1 cm2 V-1 s-1. We also estimated that bipolaron mobilities are in the range of approximately 10-100 cm2 V-1 s-1, assuming that the initial hole density is unaffected by bipolaron formation. We measured transient currents following application of voltage bias in several films, which had the features of space-charge limited currents despite being measured with coplanar electrodes. The relative nominal mobilities obtained for hole polarons in PEDOT:PSS and for bipolarons in EG-PEDOT:PSS were not inconsistent with the results obtained from the ESR and conductivity measurements. However, although the inferred mobility was voltage-independent for untreated samples with hole polarons, the inferred mobility increased steeply with the applied voltage, consistent with exp (V) behavior, for EG-treated samples.

Original languageEnglish (US)
Article number015501
JournalJournal of Applied Physics
Volume118
Issue number1
DOIs
StatePublished - Jul 7 2015

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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