Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: Poster Session 1 (joint session with BP)
CPP 19.47: Poster
Dienstag, 1. April 2014, 09:30–13:00, P1
The impact of a varying C60:C70-acceptor mixing ratio on the opto-electronic properties of planar bilayer cells — •Johannes Mahr1, Michael Brendel1, and Jens Pflaum1,2 — 1Experimental Physics VI, University of Würzburg, 97074 Würzburg — 2ZAE Bayern, 97074 Würzburg
Many small molecule organic photovoltaic cells (OPVCs) are based on the electron acceptor C60. We discuss the effect of employing C70 instead of C60 in prototypical diindenoperylene (DIP) based planar bilayer cells. As a result the short circuit current density (jsc) is increased by 25 %, whereas the other solar cell parameters such as the fill factor and the open circuit voltage remain almost unaffected. By comparison of complementary optical and electrical measurements, the gain in jsc is predominantly attributed to an enhanced absorption of the higher order fullerene C70. Both acceptor molecules under investigation, are created simultaneously in common fullerene synthesis procedures. The cost extensive step to obtain pure C60 and C70 is the separation process of the different sizes, rendering pristine mixtures of both materials much cheaper. Therefore the effect of a varying C60:C70-acceptor mixing ratio, realized by co-evaporation of the two fullerenes, on the opto-electronic properties of planar bilayer cells will be elucidated in the course of this study. The occurring changes in the devices performance will be discussed in relation with structural data obtained by AFM and X-Ray diffraction. Financial support by the DFG focus program SPP1355 is gratefully acknowledged.