Data is presented from electrical measurements on MOS structures using the
conjugated polymer regioregular poly-3-hexyl-thiophene (P3HT), a derivative
of polythiophene. Improvement of the molecular mass and chain length is ac
hieved using a process of fractionation. This is expected to produce an imp
rovement in the electronic properties of the polymer. Comparison between fr
actionated and unfractionated P3HT on both MOS and TFT devices is presented
. Metal contacts to P3HT are also studied with the formation of Schottky ba
rriers readily observed. Current is found to fit standard theory and allows
calculation of dopant levels and barrier heights all of which show good ag
reement with the ideal theory. (C) 2001 Elsevier Science B.V. All rights re
served.