A mobility study on highly stacked conducting polymer films

Abstract

Apparent mobilities of positive charge carriers in a regioregular poly(3-octylthiophene) film at various doping levels are evaluated by an electrochemical technique combining a potential-step chronocoulometry and an in-situ conductivity measurement. The carrier mobility was 5 x 10 -3 cm 2 V -1 s -1 at the lowest doping level of 0.014 %, and it decreased by about one order of magnitude as the doping level increased up to about 2 %. Further electrochemical doping resulted in the dramatic increase of the mobility, reaching 0.5 cm 2 V -1 s -1 at the highest doping level of 23 %.