Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 77: Organic electronics and photovoltaics IV (CPP, jointly with DS, HL, O)

HL 77.8: Talk

Thursday, March 14, 2013, 11:45–12:00, H34

Sub-Bandgap Absorption in Polythiophene--Fullerene Heterojunctions: Experiment and Theory — •Wichard Beenken, Felix Herrmann, Martin Presselt, Harald Hoppe, Sviatoslav Shokhovets, Gerhard Gobsch, and Erich Runge — Technische Universität Ilmenau, Institut für Physik and Institut für Mikro- und Nanotechnologien, 98693 Ilmenau, Germany

Most high-performance organic solar cells base on P3HT/PCBM bulk-heterojunctions. Spectroscopy of the sub-bandgap region, i.e., below the bulk absorption of the individual components, provides unique opportunities to study interface-related properties. In order to characterize some of the unsettled spectral features, we applied quantum-chemical calculations of a oligothiophene--fullerene model complex, which in particular allow us to identify spectral signatures of charge-transfer excitons in the sub-bandgap absorption and external quantum efficiency.