Electro-Optical Characterisation of Field Effect Devices With Regioregular Poly-Hexylthiophene Active Layers

Regioregular poly-hexylthiophene (P3HT) is currently one of the most promising active materials for high-mobility polymer field-effect transistors with mobilities reaching 0.05–0.1cm2/Vs. P3HT is a soluble, but highly ordered rigid-rod like polymer with phase separated hexyl side chains. In order to understand the transport physics of this high mobility polymer we present a careful study of the relationship between transistor performance and the electronic properties of the polaronic charge carriers probed by electro-optical modulation spectroscopy.