Please use this identifier to cite or link to this item: https://doi.org/10.1039/c9ra07648d
Title: Modulation of the doping level of PEDOT:PSS film by treatment with hydrazine to improve the Seebeck coefficient
Authors: Yemata, Temesgen Atnafu
Zheng, Yun
Kyaw, Aung Ko Ko 
Wang, Xizu
Song, Jing
Chin, Wee Shong 
Xu, Jianwei 
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry
ENHANCED THERMOELECTRIC PROPERTIES
CONDUCTIVITY ENHANCEMENT
FORMIC-ACID
THIN-FILMS
PERFORMANCE
POLY(3,4-ETHYLENEDIOXYTHIOPHENE)
SULFONATE)
ELECTRODE
TRANSPARENT
STABILITY
Issue Date: 8-Jan-2020
Publisher: ROYAL SOC CHEMISTRY
Citation: Yemata, Temesgen Atnafu, Zheng, Yun, Kyaw, Aung Ko Ko, Wang, Xizu, Song, Jing, Chin, Wee Shong, Xu, Jianwei (2020-01-08). Modulation of the doping level of PEDOT:PSS film by treatment with hydrazine to improve the Seebeck coefficient. RSC ADVANCES 10 (3) : 1786-1792. ScholarBank@NUS Repository. https://doi.org/10.1039/c9ra07648d
Abstract: As the most popular conducting polymer, poly(3,4 ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is widely used for a variety of applications, including thermoelectrics. This paper reports the modulation of the doping level by treatment with hydrazine to improve the Seebeck coefficient of PEDOT:PSS films. PEDOT:PSS films were first treated with formic acid followed by hydrazine, leading to a significant increase in the Seebeck coefficient from 17.5 to 42.7 μV K-1, about 2.5 times higher than that of the pristine film partially at the expense of electrical conductivity. An optimum power factor of 93.5 μW K-2 m-1, being 2.4 times that of the one treated with only formic acid, was achieved. The substantial improvement in the Seebeck coefficient and the power factor is collectively attributed to the removal of the PSS, and more importantly, the reduction of the doping level of PEDOT by the hydrazine treatment, which is evidenced clearly by UV-vis-NIR spectroscopy, XPS and Raman spectroscopy.
Source Title: RSC ADVANCES
URI: https://scholarbank.nus.edu.sg/handle/10635/193020
ISSN: 20462069
DOI: 10.1039/c9ra07648d
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