Please use this identifier to cite or link to this item: https://doi.org/10.1002/mame.201700429
Title: Enhanced Thermoelectric Performance of PEDOT:PSS Films by Sequential Post-Treatment with Formamide
Authors: Kyaw, Aung Ko Ko
Yemata, Temesgen A
Wang, Xizu
Lim, Siew Lay
Chin, Wee Shong 
Hippalgaonkar, Kedar
Xu, Jianwei 
Keywords: Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Polymer Science
Materials Science
electrical conductivity
formamide
PEDOT
post-treatment
thermoelectric
TRANSPARENT ELECTRODE
SEEBECK COEFFICIENT
CONDUCTIVITY
CONSTANTS
Issue Date: 1-Feb-2018
Publisher: WILEY-V C H VERLAG GMBH
Citation: Kyaw, Aung Ko Ko, Yemata, Temesgen A, Wang, Xizu, Lim, Siew Lay, Chin, Wee Shong, Hippalgaonkar, Kedar, Xu, Jianwei (2018-02-01). Enhanced Thermoelectric Performance of PEDOT:PSS Films by Sequential Post-Treatment with Formamide. MACROMOLECULAR MATERIALS AND ENGINEERING 303 (2). ScholarBank@NUS Repository. https://doi.org/10.1002/mame.201700429
Abstract: This paper reports a series of sequential post-treatments using a polar solvent formamide to enhance the thermoelectric performance of poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate) anions (PEDOT:PSS). The electrical conductivity of PEDOT:PSS films significantly increases from 0.33 S cm−1 for the pristine film to ≈2929 S cm−1 for the treated film and meanwhile the Seebeck coefficient maintains as high as 17.4 µV K−1, resulting in a power factor of 88.7 µW m−1 K−2. Formamide is a polar solvent with a high boiling point of 210 °C and high dielectric constant of 109, and PSS has a good solubility in it. Post-treatment with formamide causes not only the phase segregation of PEDOT and PSS but also the removal of insulating PSS, therefore leading to the reorientation of PEDOT chains and enhancement in mobility without altering the doping level considerably. The cross-plane thermal conductivity also reduces from 0.54 to 0.19 W m−1 K−1 after the post-treatment, leading to a figure of merit (ZT) value of 0.04 at room temperature.
Source Title: MACROMOLECULAR MATERIALS AND ENGINEERING
URI: https://scholarbank.nus.edu.sg/handle/10635/193100
ISSN: 14387492
14392054
DOI: 10.1002/mame.201700429
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