Abstract
We report the study of charge transport in the conducting polymer MEH-PPV between Au electrodes with nanogaps created by atomic force microscopy nanoscratching. Two different types of charge transport, namely space-charge-limited and Ohmic conductions, are observed. For the former case, a high mobility of around 1cm 2 V -1 s -1 at a field of 10 6 Vcm -1 is obtained. For the latter case, a high conductivity of around 10Scm -1 is obtained and a lower limit mobility of around 5cm 2 V -1 s -1 is calculated. The origin of this unusual result is not clear, but it may be due to the formation of single-crystalline domains between the electrodes, that facilitates three-dimensional band transport. © 2006 IOP Publishing Ltd.