Role of interchain coupling in the metallic state of conducting polymers

Nara Kim, Byoung Hoon Lee, Doowhan Choi, Geunjin Kim, Heejoo Kim, Jae Ryoung Kim, Jongjin Lee, Yung Ho Kahng, Kwanghee Lee

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208 Scopus citations

Abstract

We investigated the charge dynamics of the conductivity enhancement from 2 to 1000S/cm in poly(3, 4-ethylenedioxythiophene):poly(styrenesulfonate) as induced by structural changes through the addition of a polar solvent and the following solvent bath treatment. Our results indicate that the addition of a polar solvent selectively enhanced the π-π coupling of the polymer chains, resulting in the reduction of disorder and tremendously increasing the charge carrier mobility, which yielded an insulator-to-metal transition. In contrast, the following solvent bath treatment selectively enhanced the intergrain coupling, which did not affect the disorder or the mobility but increased the charge carrier density. Therefore, we demonstrate that the conduction-character defining disorder in this conducting polymer system is determined by the extent of interchain coupling.

Original languageEnglish
Article number106405
JournalPhysical Review Letters
Volume109
Issue number10
DOIs
StatePublished - 7 Sep 2012

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