A facile dedoping approach for effectively tuning thermoelectricity and acidity of PEDOT:PSS films

Tsung Che Tsai, Hsiu Cheng Chang, Chun-Hua Chen*, Yi Chia Huang, Wha Tzong Whang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

A facile approach namely controlling the pH level of 5 wt% dimethyl sulfoxide (DMSO) doped poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) solution with sodium hydroxide (NaOH) was utilized for the first time in successfully optimizing the thermoelectric conversion efficiency of PEDOT:PSS films. The largely varied Seebeck coefficients and electrical conductivities of the pH controlled PEDOT:PSS films which could thus construct a beneficial curve for locating the optimized power factor are clearly shown from the significant changes of the carrier concentration via the dedoping of PEDOT. The correlation between pH value and carrier concentration as well as the power factor is experimentally found with numerical description covering a full pH range. The applied technique and the resulting optimized thermoelectric properties and possible bio-compatibility not only provide a fundamental understanding of the thermoelectric conducting polymers but widely disclose a variety of potential applications in the future.

Original languageEnglish
Pages (from-to)641-645
Number of pages5
JournalOrganic Electronics
Volume15
Issue number3
DOIs
StatePublished - 1 Jan 2014

Keywords

  • Dedoping
  • Organic thermoelectric
  • pH Tuning

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