Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Focus Session: Structural Ordering and Electronic Transport II (jointly with CPP)

HL 13.1: Hauptvortrag

Montag, 26. März 2012, 15:00–15:30, ER 270

Single-Molecule Spectroscopy of Conjugated Polymers: Unravelling Chain Conformations from the Bottom Up — •John Lupton — Institut für Experimentelle und Angewandte Physik, Universität Regensburg — Department of Physics and Astronomy, University of Utah, Salt Lake City

When considering molecular morphology in the context of plastic electronics, one usually refers to the level of intermolecular order. Yet because of the large molecular weight and the interplay between intrinsically flexible and stiff molecular bonds, intramolecular morphology is crucial in determining the overall macroscopic properties of a material. Single-molecule fluorescence spectroscopy offers a unique approach to quantifying intrachain order and disorder, rigidity and shape, and the respective influence on electronic structure so as to construct a microscopic understanding of a functional material from the bottom up. Examples where the technique has proven particularly successful include polyfluorene, which can display a wide range of intrachain conformations including the extraordinary case of perfect defect-free pi-chains; and in polyhexylthiophene, which exhibits a uniquely broad range of conjugation lengths which can be directly mapped on the single-chain level.