Effect of doping level and morphology on the transport properties of poly(4,4 '-dipentoxy-2,2 '-bithiophene)

The transport properties of the title conducting polymer (polyET2), synthesized using two different supporting electrolytes, have been studied over a wide range of electrochemical doping levels. The Hall mobility of the material is found to be sensitive to both the carrier concentration and the molecular order, decreasing as a function of the free carrier concentration, and becoming greater with increasing molecular order. The mobilities achieved with this method are the highest so far known for this kind of material. A conduction model based on overlapping cation states is proposed.