2D coherent charge transport in highly ordered conducting polymers doped by solid state diffusion
- 9 May 2016
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nature Materials
- Vol. 15 (8), 896-902
- https://doi.org/10.1038/nmat4634
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.Keywords
This publication has 47 references indexed in Scilit:
- Hopping transport and the Hall effect near the insulator–metal transition in electrochemically gated poly(3-hexylthiophene) transistorsNature Communications, 2012
- Localized Charge Transfer in a Molecularly Doped Conducting PolymerAdvanced Materials, 2007
- Hall-effect study of an ion-bombarded polymerJournal of Applied Physics, 1996
- Electronic transport in the metallic state of oriented poly(p-phenylenevinylene)Physical Review B, 1996
- Low-temperature Hall effect and thermoelectric power in metallic PF6-doped polypyrroleSynthetic Metals, 1996
- Polymer Photovoltaic Cells: Enhanced Efficiencies via a Network of Internal Donor-Acceptor HeterojunctionsScience, 1995
- Solitons in conducting polymersReviews of Modern Physics, 1988
- Pauli and Curie susceptibilities of polythiopheneSynthetic Metals, 1987
- Investigation of the Hall effect in impurity-hopping conductionPhysical Review B, 1985
- Electrical and optical properties of highly conducting charge-transfer complexes of poly(p-phenylene)Synthetic Metals, 1980