Regensburg 2004 – wissenschaftliches Programm

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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 5: Poster

SYOH 5.43: Poster

Donnerstag, 11. März 2004, 18:00–21:00, B

Numerical simulation of photovoltaic devices based on organic materials — •Fryderyk Kozlowski, Wenge Guo, Bert Maennig, Jens Drechsel, Martin Pfeiffer, and Karl Leo — Institut für Angewandte Photophysik,01069 Dresden, Germany

We have modelled the optical and electrical behaviours of organic (p-i-n) and (p-i-i-n) solar cells fabricated in our laboratory by numerical simulations. In the cells with structure (p-i-n), the dissociation of exitons and free carrier creation occurrs in a photoactive mixed layer (i) e.g. zinc phthalocyanine mixed with fullerene (ZnPc:C60). The photovoltaic devices based on a photoactive donor-acceptor heterojunction with a p-i-i-n architecture consist of the same organic materials. Here however, exitons are formed in bulk materials and the dissociation of the excitons takes place at the interface of neat ZnPc and C60 layers. In the numerical model describing the electrical properties, we took into account effects like bipolar charge carrier drift and diffusion, bulk and interface recombination, trapping, creation, diffusion and quenching of exitons. The distribution of generated free carriers in the mixed layer or the generation profile of exitons in heterojunctions, respectively, is calculated from optical simulations. By including trap-mediated recombination for (p-i-n) solar cells, we are able to simulate the linear dependence of the short circuit current on light intensity. Furthermore, we study the optimum thickness of the active layer and compare it with experimental data. Finally, we show the temperature dependence of short circuit current and open circuit voltage.

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