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Simultaneous Increases in Electrical Conductivity and Seebeck Coefficient of PEDOT:PSS Films by Adding Ionic Liquids into a Polymer Solution

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Abstract

The electrical conductivity and Seebeck coefficient of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) films were simultaneously improved by adding an ionic liquid (IL) into a polymer solution of the polymers. The maximum electrical conductivity of such a PEDOT:PSS/IL film reached 174 S cm−1, more than an order of magnitude higher than that of pure PEDOT:PSS film, and the maximum Seebeck coefficient was up to 30 μV K−1, more than twice the value for pure PEDOT:PSS film. This behavior is different from conventional thermoelectric (TE) materials, whose TE properties are strongly correlated, such as increasing electrical conductivity with increasing carrier concentration, usually resulting in a logarithmic decrease in Seebeck coefficient. Atomic force microscopy images of the PEDOT:PSS/IL films indicated that the ILs induced formation of a particular three-dimensional structure of highly conducting PEDOT grains, resulting in improvement of the TE performance of PEDOT:PSS films.

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Authors and Affiliations

  1. Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology, Normal University, Nanchang, 330013, China

    Congcong Liu, Jingkun Xu, Baoyang Lu, Ruirui Yue & Fangfang Kong

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  1. Congcong Liu
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  2. Jingkun Xu
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  3. Baoyang Lu
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  5. Fangfang Kong
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Correspondence to Jingkun Xu.

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Liu, C., Xu, J., Lu, B. et al. Simultaneous Increases in Electrical Conductivity and Seebeck Coefficient of PEDOT:PSS Films by Adding Ionic Liquids into a Polymer Solution. J. Electron. Mater. 41, 639–645 (2012). https://doi.org/10.1007/s11664-012-1942-8

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  • DOI: https://doi.org/10.1007/s11664-012-1942-8

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