Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 44: Poster IV: Thin film photovoltaics; Organic electronics and photovoltaics (jointly with CPP, HL, O); Organic thin films; Trends in atomic layer deposition (Focused session)

DS 44.17: Poster

Freitag, 30. März 2012, 09:30–12:00, Poster E

Does NEXAFS provide valuable information on the electronic influence of functional groups? — •Christian Schmidt, Tobias Breuer, Michael Klues, and Gregor Witte — Molekulare Festkörperphysik, Philipps-Universität Marburg, Germany

Motivated by their possible application in organic electronic devices a variety of systematically modified acene derivatives is nowadays investigated. A question that frequently arises is whether the introduction of functional groups (e.g. electronegative fluorine atoms) affects the electronic system by intramolecular dipoles or by direct interaction with the aromatic system. From an experimental point of view this question is not easy accessible, especially for thin films. Our approach is to employ NEXAFS as a versatile tool that gives insight into both: geometric and electronic structure. We investigated differently substituted molecules and addressed functional groups directly by conducting angular dependent NEXAFS experiments at the corresponding absorption K-edge (e.g. F1s, O1s, N1s). In order to interpret these spectra, we contrast them with carbon K-edge spectra of the aromatic backbone and provide a detailed analysis of the origin and dichroism of related resonances. This systematic use of NEXAFS enables us to give further insight into the electronic properties of derivatized acenes.