Regensburg 2013 – scientific programme

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DS: Fachverband Dünne Schichten

DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells

DS 32.36: Poster

Thursday, March 14, 2013, 17:00–20:00, Poster B2

Orientation and self organization properties of new low band-gap polymers — •Umut Aygül¹, David Batchelor², Ulf Dettinger¹, Florian Latteyer¹, Milutin Ivanovic¹, Heiko Peisert¹, and Thomas Chassé¹ — ¹Eberhard Karls Universität Tübingen, Institut für Physikalische und Theoretische Chemie — ²Karlsruher Institut für Technologie, Institut für Synchrotron Strahlung

In polymer based organic solar cells so called "Low Band-Gap" (LBG) polymers with their alternating electron-deficient and electron-rich subunits are promising donor components. The orientation and the electronic properties of these polymers play an important role in device performance and therefore a detailed understanding is necessary. The orientation was investigated via angular dependent NEXAFS (Near Edge X-Ray Absorption Fine Structure) measurements of the Sulfur K-edge as for 1s absorption edges the analysis of transitions into π* molecular orbitals enables a relatively simple and direct determination of the molecular orientation. Obviously both the chemical and geometrical structure of the polymers determines the ability for self-organization. Consequently we studied the orientation of the LBG polymers PCPDTBT, Si-PCPDTBT and PCPDTBBT. Furthermore the influence of the acceptor molecule PCBM on the self organization properties of these polymers was studied by NEXAFS measurements of donor/acceptor blend films with varying amount of PCBM. In some cases a subsequent annealing step increases the ability for self-organization significantly.