Enhanced high temperature thermoelectric response of sulphuric acid treated conducting polymer thin films

S. R. Sarath Kumar, Narendra Kurra, Husam N. Alshareef

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

We report the high temperature thermoelectric properties of solution processed pristine and sulphuric acid treated poly(3, 4-ethylenedioxythiophene):poly(4-styrenesulfonate) (or PEDOT:PSS) films. The acid treatment is shown to simultaneously enhance the electrical conductivity and Seebeck coefficient of the metal-like films, resulting in a five-fold increase in thermoelectric power factor (0.052 W/m. K ) at 460 K, compared to the pristine film. By using atomic force micrographs, Raman and impedance spectra and using a series heterogeneous model for electrical conductivity, we demonstrate that acid treatment results in the removal of PSS from the films, leading to the quenching of accumulated charge-induced energy barriers that prevent hopping conduction. The continuous removal of PSS with duration of acid treatment also alters the local band structure of PEDOT:PSS, resulting in simultaneous enhancement in Seebeck coefficient.
Original languageEnglish (US)
Pages (from-to)215-221
Number of pages7
JournalJ. Mater. Chem. C
Volume4
Issue number1
DOIs
StatePublished - 2016

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