Berlin 2008 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 35: Nanostructured block copolymer films (SYSA 8)
DS 35.1: Hauptvortrag
Donnerstag, 28. Februar 2008, 17:00–17:30, H 2032
Nanostructure and transport in regioregular polythiophenes and their block copolymers — Rui Zhang1, Bo Li1, Jessica R. Cooper1, Mihaela Iovu1, Genevevie Sauve1, David N. Lambeth1, Detlef-M. Smilgies2, Richard D. McCullough1, and •Tomasz Kowalewski1 — 1Department of Chemistry, Carnegie Mellon University , 4400 Fifth Avenue, Pittsburgh, PA 15213 — 2Cornell University, Ithaca, NY, USA
This presentation will describe the results of combined atomic force microscopy (AFM) and grazing incidence small and wide angle x-ray scattering (GISAXS/GIWAXS) studies of narrow polydispersity regioregular poly(alkyltiophenes) (PATs) and their block copolymers. Well-defined PATs were shown to have a high tendency to form nanofibrillar structures with the nanofibril widths closely related to the contour lengths of polymer molecules. Moreover, carrier mobilities in field effect transistors fabricated from PATs exhibiting nanofibrillar morphologies exhibited exponential dependence on nanofibril width. The significance of this relationship as well as the morphology of block copolymers of PATs with immiscible segments and its impact on transport properties will be also discussed.