Abstract
Experiments such as magnetic resonance and picosecond photoconductivity demonstrate the existence of freely moving solitons in undoped polyacetylene with a mobility of ∼1 cm 2/Vs from 3000K down to ∼75K. There is evidence also for freely moving polarons. We review the theoretical calculations of soliton and polaron transport due to phonon and defect scattering. It is found that, contrary to suggestions in the literature, neither hot solitons nor polarons could have been observed in the picosecond photoconductivity experiments. Nevertheless the results are in good agreement with the peak ps photoconductivity observed from 300 to 80K, although not below, and with the magnetic resonance data down to ∼4K. The lack of agreement with the low-temperature photoconductivity and the nature of traps observed for the charged solitons are discussed.
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