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- W2018317801 abstract "It is shown that impedence spectroscopy provides a powerful technique for the electrical characterization of (undoped) conducting polymers. Even if these polymers are only available as a powder due to poor processability, it is possible to determine the polarization mechanisms. The polarization might, e.g., originate from transport of charge carriers localized on a single conjugated chain or in grains. The results that can be obtained are illustrated by the analysis of a poly(3-n-hexylthiophene) powder prepared by oxidative coupling. The dielectric response of the poly(3-n-hexylthiophene) powder (measured at temperatures between −160 and +160 °C and frequencies between 0.01 Hz and 65 kHz) is described by a combination of three distinct mechanisms of charge transport. The response at high frequencies is largely determined by an enhanced electronic polarization due to the delocalization of the electrons along the conjugated backbone of the polymer. In parallel with this polarization mechanism nearest-neighbour hopping (with an activation energy of 0.18 eV) and thermally activated transport of charge carriers blocked at the grain boundaries are observed." @default.
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- W2018317801 date "1991-09-01" @default.
- W2018317801 modified "2023-10-17" @default.
- W2018317801 title "Dielectric properties of poly(3-n-hexylthiophene) powder" @default.
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- W2018317801 doi "https://doi.org/10.1016/0379-6779(91)91820-z" @default.
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