Quasi-one dimensional in-plane conductivity in filamentary films of PEDOT:PSS
The mechanism and magnitude of the in-plane conductivity of poly(3,4-ethy-lenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thin films is determined using temperature dependent conductivity measurements for various PEDOT:PSS weight ratios with and without a high boiling solvent (HBS). Without t...
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| Hauptverfasser: | , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
19 June 2013
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| In: |
Advanced functional materials
Year: 2013, Jahrgang: 23, Heft: 46, Pages: 5778-5786 |
| ISSN: | 1616-3028 |
| DOI: | 10.1002/adfm.201301174 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1002/adfm.201301174 Verlag, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.201301174 
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| Verfasserangaben: | Kevin van de Ruit, Racheli Itzhak Cohen, Dirk Bollen, Ton van Mol, Rachel Yerushalmi‐Rozen, René A. J. Janssen, and Martijn Kemerink |
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| 245 | 1 | 0 | |a Quasi-one dimensional in-plane conductivity in filamentary films of PEDOT:PSS |c Kevin van de Ruit, Racheli Itzhak Cohen, Dirk Bollen, Ton van Mol, Rachel Yerushalmi‐Rozen, René A. J. Janssen, and Martijn Kemerink |
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| 520 | |a The mechanism and magnitude of the in-plane conductivity of poly(3,4-ethy-lenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thin films is determined using temperature dependent conductivity measurements for various PEDOT:PSS weight ratios with and without a high boiling solvent (HBS). Without the HBS the in-plane conductivity of PEDOT:PSS is lower and for all studied weight ratios well described by the relation $ \sigma = \sigma _0 \rm exp[- \left(T_0øverT \right)^0.5] $ with T0 a characteristic temperature. The exponent 0.5 indicates quasi-one dimensional (quasi-1D) variable range hopping (VRH). The conductivity prefactor σ0 varies over three orders of magnitudes and follows a power law σ0∝c3.5PEDOT with cPEDOT the weight fraction of PEDOT in PEDOT:PSS. The field dependent conductivity is consistent with quasi-1D VRH. Combined, these observations suggest that conductance takes place via a percolating network of quasi-1D filaments. Using transmission electron microscopy (TEM) filamentary structures are observed in vitrified dispersions and dried films. For PEDOT:PSS films with HBS, the conductivity also exhibits quasi-1D VRH behavior when the temperature is less than 200 K. The low characteristic temperature T0 indicates that HBS-treated films are close to the critical regime between a metal and an insulator. In this case, the conductivity prefactor scales linearly with cPEDOT, indicating the conduction is no longer limited by a percolation of filaments. The lack of observable changes in TEM upon processing with the HBS suggests that the changes in conductivity are due to a smaller spread in the conductivities of individual filaments, or a higher probability for neighboring filaments to be connected rather than being caused by major morphological modification of the material. | ||
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| 700 | 1 | |a Bollen, Dirk |e VerfasserIn |4 aut | |
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| 700 | 1 | |a Kemerink, Martijn |e VerfasserIn |0 (DE-588)1200360753 |0 (DE-627)1683330668 |4 aut | |
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