Abstract
We report the study of charge transport in the conducting polymer MEH-PPV between Auelectrodes with nanogaps created by atomic force microscopy nanoscratching.Two different types of charge transport, namely space-charge-limited and Ohmicconductions, are observed. For the former case, a high mobility of around1 cm2 V−1 s−1 at afield of 106 V cm−1 is obtained. For the latter case, a high conductivity of around10 S cm−1 is obtained and a lower limit mobility of around5 cm2 V−1 s−1 is calculated. The origin of this unusual result is not clear, but it may be due to theformation of single-crystalline domains between the electrodes, that facilitatesthree-dimensional band transport.
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