Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 24: Organic Electronics and Photovoltaics I (jointly with CPP, DS, HL)
O 24.1: Talk
Monday, March 11, 2013, 17:15–17:30, H32
Correlation between interface energetics and open circuit voltage in organic photovoltaic cells — •Andreas Wilke1, James Endres2, Ulrich Hörmann3, Jens Niederhausen1, Raphael Schlesinger1, Johannes Frisch1, Patrick Amsalem1, Julia Wagner3, Mark Gruber3, Andreas Opitz1, Antje Vollmer4, Wolfgang Brütting3, Antoine Kahn2, and Norbert Koch1,4 — 1Humboldt-Universität zu Berlin, Institut für Physik, Brook-Taylor-Str. 15, D-12489 Berlin, Germany — 2Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA — 3Universität Augsburg, Institut für Physik, Universitätsstr. 1, D-86135 Berlin, Germany — 4Helmholtz-Zentrum Berlin für Materialien und Energie GmbH BESSY II, Albert-Einstein-Str. 15, D-12489 Berlin, Germany
We have used ultraviolet and inverse photoemission spectroscopy to determine the transport gaps (ET) of C60 and diindenoperylene (DIP), and the photovoltaic gap (EPVG) of five prototypical donor/acceptor interfaces used in organic photovoltaic cells (OPVCs). The transport gap of C60 (2.5 ± 0.1) eV and DIP (2.55 ± 0.1) eV at the interface is the same as in pristine films. We find nearly the same energy loss of ca. 0.5 eV for all material pairs when comparing the open circuit voltage measured for corresponding OPVCs and EPVG.