Anisotropic hopping conduction in spin-coated PEDOT: PSS thin films

The charge transport in spin-coated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been investigated as a function of temperature and electric field. Both the magnitude and the transport mechanism are found to be strongly anisotropic. This striking behavior is quantitatively...

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Main Authors: Mantovani Nardes, Alexandre (Author) , Kemerink, Martijn (Author) , Janssen, René A. J. (Author)
Format: Article (Journal)
Language:English
Published: 20 August 2007
In: Physical review. B, Condensed matter and materials physics
Year: 2007, Volume: 76, Issue: 8
ISSN:1550-235X
DOI:10.1103/PhysRevB.76.085208
Online Access:Verlag, Volltext: https://doi.org/10.1103/PhysRevB.76.085208
Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.76.085208
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Author Notes:A.M. Nardes, M. Kemerink, and R.A.J. Janssen

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520 |a The charge transport in spin-coated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been investigated as a function of temperature and electric field. Both the magnitude and the transport mechanism are found to be strongly anisotropic. This striking behavior is quantitatively explained in terms of a morphological model in which flattened, quasimetallic PEDOT-rich grains are organized in horizontal layers that are separated by continuous insulating PSS lamellas. In this model, the in-plane conductivity is described by three-dimensional variable range hopping between ∼25nm sized PEDOT-rich particles separated by subnanometer PSS barriers, while the out-of-plane conductivity is described by nearest-neighbor hopping between more widely spaced molecular sites. These length scales are supported by previously reported scanning probe measurements. 
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