Regensburg 2004 – wissenschaftliches Programm

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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 5: Poster

SYOH 5.71: Poster

Donnerstag, 11. März 2004, 18:00–21:00, B

Influences on the mobility in poly-(3-hexylthiophene) based organic field effect transistors — •Holger Heil, Roland Schmechel, and Heinz von Seggern — Insitute of Material Science, Darmstadt University of Technology, Petersenstr. 23, 64287 Darmstadt, Germany

Regioregular head-to-tail coupled poly-(3-hexylthiophene) polymers (P3HT) are one of the most promising candidates for application in organic field effect transistors (OFETs) due to their self-ordering properties. The effect of surface treatment as well as mechanical rubbing of the polymer layer on the morphology, texture and orientation of the molecules were investigated by means of optical and x-ray diffraction methods and were correlated to the obtained field effect mobility. It could be demonstrated that mechanical rubbing along the transport direction results in an orientation of the polymer chains and enhances the field effect mobility. But an enhanced crystallinity due to surface treatment of the insulator surface or drop casting of the polymer results in an even more increased mobility. The results are discussed with respect to the importance of inter- and intra-chain charge transfer processes to the overall charge transport.