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 32.25: Poster

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

Energy level alignment at interfaces between low-band-gap polymers and C60 — •Milutin Ivanovic¹, Heiko Peisert¹, Ines Dumsch², Michael Forster², Ulrich Scherf², and Thomas Chassé¹ — ¹Institut für Physikalische und Theoretische Chemie, Universität Tübingen, Tübingen, Germany — ²Makromolekulare Chemie und Institut für Polymertechnologie, Bergische Universität Wuppertal, Wuppertal, Germany

In electronic devices based on organic materials, the properties of interfaces are as important as the organic substances itself. Bulk heterojunctions(BHJ)play a crucial role in several devices, such as organic light emitting devices (OLEDs), organic field-effect transistors, and organic photovoltaic devices (OPVs). As example, in bulk heterojunction solar cells the interface between the donor and the acceptor material determines the ability for charge separation and the maximal reachable open circuit voltage. We study electronic properties of interfaces between low band gap (LBG) polymers (promising candidates for donor materials in OPVs) and C60 (model molecule for the acceptor material). We focus on the LBG polymers PCPDTBT, Si-PCPDTBT, PCPDTBBT and Benzoselenadiazole-based low band gap polymers. C60 films were evaporated on doctor blade casted polymer films in UHV. The interfaces were studied using X-ray photoemission spectroscopy (XPS) and Ultraviolet photoemission spectroscopy (UPS).