Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 35: Joint Session: Organic Semiconductors II: Solar Cells B
HL 35.6: Vortrag
Dienstag, 15. März 2011, 12:00–12:15, ZEU 222
Charge separation at molecular donor-acceptor interfaces: correlation between interface morphology and solar cell performance — •Andreas Opitz, Julia Wagner, Mark Gruber, Ulrich Hörmann, and Wolfgang Brütting — Institute of Physics, University of Augsburg, 86135 Augsburg, Germany
Combinations of organic electron and hole conductive materials are widely used for ambipolar charge carrier transport and donor/acceptor photovoltaic cells. Thereby the efficiency of these excitonic solar cells is correlated to the morphology of the interface between the donor and the acceptor materials.
In this contribution we show the effect of crystallization behaviour on molecular bulk and planar heterojunction solar cells [1]. Different donor (copper phthalocyanine – CuPc, diindenoperylene – DIP) and acceptor (Fullerene – C60, per-fluorinated copper phthalocyanine – F16CuPc) materials are analysed for their growth morphology in planar and mixed films as well as for their performance in photovoltaic cells. The morphology of the blended layer ranges from molecularly mixed films in the case of the two phthalocyanines to phase-separated films when mixing CuPc or DIP with C60. A corrugated interface is found for bilayered structure of DIP/C60 [2]. Additionally a good crystallization behaviour of DIP improves the solar cell performance even for its lower absorption in comparison to CuPc.
[1] A. Opitz et al., IEEE J. Sel. Top. Quant. (2010), early view.
[2] J. Wagner et al. Adv. Func. Mater. (2010), early view.