Enhanced high temperature thermoelectric response of sulphuric acid treated conducting polymer thin films
KAUST DepartmentMaterials Science and Engineering Program
Permanent link to this recordhttp://hdl.handle.net/10754/583404
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AbstractWe 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.
CitationEnhanced high temperature thermoelectric response of sulphuric acid treated conducting polymer thin films 2015 J. Mater. Chem. C
PublisherRoyal Society of Chemistry (RSC)
JournalJ. Mater. Chem. C