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Improving the electrical conductivity of PEDOT:PSS films by binary secondary doping

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Abstract

In this work, the electrical conductivity of poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS) films was effectively enhanced by binary secondary doping. Initially, doping with 5 vol.% dimethyl sulfoxide (DMSO) improved the electrical conductivity from 0.3 S cm−1 to 437 S cm−1 and a further increase to 950 S cm−1 was achieved by adding LiClO4. The conductivity value we report here is one of the highest reported for pretreated PEDOT:PSS films. The obtained maximum electrical conductivity is almost 3000 times higher than that shown by pristine PEDOT:PSS films. The increase in the electrical conductivity is ascribed to the synergistic effect of the two dopants. Fourier transform infrared spectra indicated the absence of any changes to the chemical structure of PEDOT:PSS. Atomic force microscopy images demonstrate an increased surface roughness and suggest the occurrence of conformational changes of PEDOT chains from the coiled to coil-extended one, which is the key reason for the electrical conductivity enhancement. The pretreatments we propose here are rapid, simple and effective for the large-scale preparation of high-conductivity 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

    Zhengyou Zhu, Congcong Liu, Jingkun Xu, Qinglin Jiang, Hui Shi & Endou Liu

Authors
  1. Zhengyou Zhu
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  2. Congcong Liu
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  3. Jingkun Xu
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  4. Qinglin Jiang
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  5. Hui Shi
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  6. Endou Liu
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Correspondence to Jingkun Xu.

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The authors contributed equally to this work.

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Zhu, Z., Liu, C., Xu, J. et al. Improving the electrical conductivity of PEDOT:PSS films by binary secondary doping. Electron. Mater. Lett. 12, 54–58 (2016). https://doi.org/10.1007/s13391-015-5272-x

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  • DOI: https://doi.org/10.1007/s13391-015-5272-x

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