Enhanced high temperature thermoelectric response of sulphuric acid treated conducting polymer thin films
KAUST DepartmentMaterials Science and Engineering Program
MetadataShow full item record
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