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Why does the electrical conductivity in PEDOT:PSS decrease with PSS content? : A study combining thermoelectric measurements with impedance spectroscopy

Title data

Stöcker, Thomas ; Köhler, Anna ; Moos, Ralf:
Why does the electrical conductivity in PEDOT:PSS decrease with PSS content? : A study combining thermoelectric measurements with impedance spectroscopy.
In: Journal of Polymer Science Part B: Polymer Physics. Vol. 50 (2012) Issue 14 . - pp. 976-983.
ISSN 1099-0488
DOI: 10.1002/polb.23089

Official URL: Volltext

Abstract in another language

We have investigated the electrical transport properties of poly(3,4-ethylenedioxythiophen)/poly(4-styrene-sulfonate) (PEDOT:PSS) with PEDOT-to-PSS ratios from 1:1 to 1:30. By combining impedance spectroscopy with thermoelectric measurements, we are able to independently determine the variation of electrical conductivity and charge carrier density with PSS content. We find the charge carrier density to be independent of the PSS content. Using a generalized effective media theory, we show that the electrical conductivity in PEDOT:PSS can be understood as percolation between sites of highly conducting PEDOT:PSS complexes with a conductivity of 2.3 (Ωcm)^−1 in a matrix of excess PSS with a low conductivity of 10^−3 (Ω cm)^−1. In addition to the transport properties, the thermoelectric power factors and Seebeck coefficients have been determined.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Research Institutions
Research Institutions > Research Centres
Profile Fields > Advanced Fields > Advanced Materials
Profile Fields
Profile Fields > Advanced Fields
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 19 Jan 2015 09:53
Last Modified: 14 Apr 2016 06:36
URI: https://eref.uni-bayreuth.de/id/eprint/5596