Abstract
Mobilities of positive charge carriers in a polythiophene film at different oxidation stages are evaluated on the bases of elaborate electrochemical measurements. The mobility in the low doping regime, most likely that of polarons, is 10 −6 cm 2 V −1 s −1. The mobility starts to increase at around 0.2 mol% doping level and reaches 0.5×10 −2 cm 2 V −1 s −1 in the heavily doped region. The drastic mobility increase by doping manifests changes in nature and/or kind of charge-carrying species, or the switching of conduction mechanisms in the ClO 4 --doped polythiophene film.
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