期刊
SYNTHETIC METALS
卷 247, 期 -, 页码 124-130出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2018.11.019
关键词
Conducting polymer; Polyaniline; Mobility; Hall effect; Polaron; Hopping; Scattering
资金
- JSPS KAKENHI [JP17K06303, JP16K04877]
The conductivity a and carrier density n of the conducting polymer polyaniline were investigated by changing the concentration x of a secondary dopant, meta-cresol. We found that a changes by four orders of magnitude within the x-range of 1-10%, while n, as estimated from the Hall measurements, shows a weak dependence on x in the region of 2% < x < 50%. These results suggest that a can be enhanced by the change in the mobility mu. We analyzed the temperature dependence of mu by not only the combination of two different types of scattering mechanism, but also by the polaron hopping model. The experimental data of mu(T) can be explained well by the latter model with reasonable fitting parameter values of a small-polaron binding energy and a longitudinal optical phonon frequency.
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