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2D coherent charge transport in highly ordered conducting polymers doped by solid state diffusion
OA Location
Author(s)
Kang, K
Watanabe, S
Broch, K
Sepe, A
Brown, A
Type
Journal Article
Abstract
Doping is one of the most important methods to control charge carrier concentration in semiconductors. Ideally, the introduction of dopants should not perturb the ordered microstructure of the semiconducting host. In some systems, such as modulation-doped inorganic semiconductors or molecular charge transfer crystals, this can be achieved by spatially separating the dopants from the charge transport pathways. However, in conducting polymers, dopants tend to be randomly distributed within the conjugated polymer, and as a result the transport properties are strongly affected by the resulting structural and electronic disorder. Here, we show that in the highly ordered lamellar microstructure of a regioregular thiophene-based conjugated polymer, a small-molecule p-type dopant can be incorporated by solid state diffusion into the layers of solubilizing side chains without disrupting the conjugated layers. In contrast to more disordered systems, this allows us to observe coherent, free-electron-like charge transport properties, including a nearly ideal Hall effect in a wide temperature range, a positive magnetoconductance due to weak localization and the Pauli paramagnetic spin susceptibility.
Date Issued
2016-05-09
Date Acceptance
2016-03-30
Citation
Nature Materials, 2016, 15, pp.896-902
URI
URL
DOI
ISSN
1476-4660
Publisher
Nature Publishing Group
Start Page
896
End Page
902
Journal / Book Title
Nature Materials
Volume
15
Copyright Statement
© 2016 Macmillan Publishers Limited. All rights reserved. The final publication is available at Springer via https://doi.org/10.1038/nmat4634
Identifier
PII: nmat4634
Subjects
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Materials Science
Physics
FIELD-EFFECT TRANSISTORS
ORGANIC SEMICONDUCTORS
IMPURITY CONDUCTION
TRANSFER INTERFACES
HOPPING TRANSPORT
METALLIC STATE
POLYACETYLENE
POLYANILINE
POLY(3,4-ETHYLENEDIOXYTHIOPHENE)
MAGNETORESISTANCE
Nanoscience & Nanotechnology
Publication Status
Published
Date Publish Online
2016-05-09