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Quasi-One Dimension...
Quasi-One Dimensional in-Plane Conductivity in Filamentary Films of PEDOT:PSS
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- van de Ruit, Kevin (författare)
- Eindhoven University of Technology, Netherlands
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- Itzhak Cohen, Racheli (författare)
- Ben Gurion University of Negev, Israel
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- Bollen, Dirk (författare)
- Agfa Gevaert NV, Belgium
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- van Mol, Ton (författare)
- Holst Centre TNO, Netherlands
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- Yerushalmi-Rozen, Rachel (författare)
- Ben Gurion University of Negev, Israel; Ben Gurion University of Negev, Israel
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- Janssen, Rene A. J. (författare)
- Eindhoven University of Technology, Netherlands
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- Kemerink, Martijn (författare)
- Eindhoven University of Technology, Netherlands
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(creator_code:org_t)
- 2013-06-19
- 2013
- Engelska.
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Ingår i: Advanced Functional Materials. - : Wiley-VCH Verlag. - 1616-301X .- 1616-3028. ; 23:46, s. 5778-5786
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The mechanism and magnitude of the in-plane conductivity of poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT: PSS) thin fi lms 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 s = s0exp[-T0 T 0.5] with T 0 a characteristic temperature. The exponent 0.5 indicates quasi-one dimensional (quasi-1D) variable range hopping (VRH). The conductivity prefactor s 0 varies over three orders of magnitudes and follows a power law s 0. c 3.5 PEDOT with c PEDOT the weight fraction of PEDOT in PEDOT: PSS. The fi eld dependent conductivity is consistent with quasi-1D VRH. Combined, these observations suggest that conductance takes place via a percolating network of quasi-1D fi laments. Using transmission electron microscopy (TEM) fi lamentary structures are observed in vitrifi ed dispersions and dried fi lms. For PEDOT: PSS fi lms with HBS, the conductivity also exhibits quasi-1D VRH behavior when the temperature is less than 200 K. The low characteristic temperature T 0 indicates that HBStreated fi lms are close to the critical regime between a metal and an insulator. In this case, the conductivity prefactor scales linearly with c PEDOT, indicating the conduction is no longer limited by a percolation of fi laments. 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 fi laments, or a higher probability for neighboring fi laments to be connected rather than being caused by major morphological modifi cation of the material.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- charge transport; conducting polymers; organic electronics
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