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Enhancing thermoelectric properties by using metal/semi-metal interface with surface polarization effect based on PEDOT:PSS thick thin

Abstract

Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) as a semi-metal material is a promising thermoelectric material with polaron-type transport property. PEDOT:PSS possesses a large density of polaron energy levels within the bandgap. In this article, we report a big power factor (PF) of 96 μW/(mK2) by combining semi-metal PEDOT:PSS with metal layers with vertical sandwiched device configuration(metal/PEDOT:PSS/metal) at relatively high temperature conditions. The capacitance-voltage and atomic force microscopy (AFM) studies suggest that the polarons largely contribute to surface polarization in metal/PEDOT:PSS/metal device due to electron-phonon coupling. The electrode and temperature dependent capacitance mainly originates from surface polarization effect, in which the surface polarization function as an additional driving force to diffuse the charge carriers from hot to cold surface. Essentially, the surface polarization generates a high Seebeck effect with a high electrical conductivity, resulting in a large PF. Finally, we have successfully detected the thermal current density in the Au(hot)/PEDOT:PSS/Au(cold) device, which confirms that the surface polarization can indeed function as an additional driving force to enhance Seebeck effects through metal/semi-metal interface device structure.

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Publication details

The article was received on 30 Dec 2018, accepted on 09 Apr 2019 and first published on 11 Apr 2019


Article type: Paper
DOI: 10.1039/C8TC06616G
Citation: J. Mater. Chem. C, 2019, Accepted Manuscript

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    Enhancing thermoelectric properties by using metal/semi-metal interface with surface polarization effect based on PEDOT:PSS thick thin

    L. Peng and Z. Liu, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C8TC06616G

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