Electro-optical characterisation of field effect devices with regioregularpoly-hexylthiophene active layers

Regioregular poly-hexylthiophene (P3HT) is currently one of the most promis ing active materials for high-mobility polymer field-effect transistors wit h mobilities reaching 0.05-0.1cm(2)/Vs. P3HT is a soluble, but highly order ed rigid-rod like polymer with phase separated hexyl side chains. In order to understand the transport physics of this high mobility polymer we presen t a careful study of the relationship between transistor performance and th e electronic properties of the polaronic charge carriers probed by electro- optical modulation spectroscopy.