Enhanced thermoelectric properties of PEDOT:PSS nanofilms by a chemical dedoping process

Hongkwan Park, Seung Hwan Lee, Felix Sunjoo Kim, Hyang Hee Choi, In Woo Cheong, Jung Hyun Kim

Research output: Contribution to journalArticle

140 Citations (Scopus)

Abstract

We report that a simple chemical dedoping treatment of poly(3,4- ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) nanofilms enhances the thermoelectric properties of the polymer nanofilms. The dedoping process was done by over-coating a mixture of dimethyl sulfoxide (DMSO) and hydrazine (HZ), a strong chemical reducing agent, onto the PEDOT:PSS nanofilms. This additional step led to the removal of excess PSS chains and the formation of neutral states of PEDOT chains, resulting in an improvement in the Seebeck coefficient, from 30 μV K-1 to 142 μV K-1, and a decrease in the electrical conductivity from 726 S cm-1 to 2 S cm-1. By controlling the concentration of HZ, we obtained an optimized power factor of 112 μW m-1 K-2 at 0.0175 wt% of HZ in DMSO at room temperature. The corresponding electrical conductivity and Seebeck coefficient under optimized conditions were 578 S cm-1 and 67 μV K -1, respectively. We expect that this simple dedoping process can be applied to general thermoelectric nanofilms based on chemically doped polymers in order to enhance the power factor. This journal is

Original languageEnglish
Pages (from-to)6532-6539
Number of pages8
JournalJournal of Materials Chemistry A
Volume2
Issue number18
DOIs
Publication statusPublished - 2014 May 14

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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