Anisotropic hopping conduction in spin-coated PEDOT : PSS thin films
2007 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 76, no 8, 085208Article in journal (Refereed) Published
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 similar to 25 nm 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.
Place, publisher, year, edition, pages
American Physical Society , 2007. Vol. 76, no 8, 085208
IdentifiersURN: urn:nbn:se:liu:diva-118197DOI: 10.1103/PhysRevB.76.085208ISI: 000249155400049OAI: oai:DiVA.org:liu-118197DiVA: diva2:813498