Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: Poster: Organic Electronics and Photovoltaics
CPP 30.26: Poster
Dienstag, 8. März 2016, 18:15–21:00, Poster B2
Spatial Orientation and Order of Structure-Defining Subunits in Thin Films of a High Electron Mobility n-Type Copolymer (P(NDI2OD-T2)) as Studied by Infrared Transition Moment Orientational Analysis (IR-TMOA) — •Arthur Markus Anton1, Robert Steyrleuthner2,3, Wilhelm Kossack1, Falk Frenzel1, Dieter Neher2, and Friedrich Kremer1 — 1Universität Leipzig, Institut für Experimentelle Physik I, Leipzig, Germany — 2Universität Potsdam, Intitut für Physik und astronomie, Potsdam, Germany — 3Freie Universität Berlin, Fachberecih Physik, Berlin, Germany
In order to investigate the molecular order in thin layers of P(NDI2OD-T2) the method of infrared transition moment orientational analysis (IR–TMOA), is employed. Structure-specific vibrational bands are analyzed in dependence on polarization and inclination of the sample film with respect to the optical axis. By means of IR specificity we deduce the molecular order parameter tensor for the respective moieties with regard to the sample coordinate system and determine independently the orientation and order of atomistic planes defined through the naphthalenediimide (NDI) and bithiophene (T2) units relative to the substrate, and hence, relative to each other. We observe that the polymer backbones in a 150 nm-thick film exhibit a pronounced in-plane anisotropy proving self-aggregated long range order, even though the sample is spin-coated from solution. For µm-thick films the anisotropy vanishes while the inclination of the NDI unit remains basically unaffected. [Anton et al., J. Am. Chem. Soc. 137 (2015) 6034]