Regensburg 2007 – wissenschaftliches Programm
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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.58: Poster
Dienstag, 27. März 2007, 18:00–20:00, Poster B
Anticorrelation between exciplex emission and photovoltaic efficiency in PPV polymer based solar cells — •chunhong yin1, Thomas Kietzke1,2, Dieter Neher1, and Hans-Heinrich Hörhold3 — 1University of Potsdam, Institute of Physics, Am Neuen Palais 10, 14469 Potsdam, Germany — 2nstitute of Materials Research and Engineering (IMRE), Research Link 3, 117602 Singapore — 3University of Jena, Institute of Organic Chemistry and Macromolecular Chemistry, Humboldtstr. 10, 07743 Jena, Germany
By studying the photoluminescence emission and photovoltaic properties of blends of PPV-based electron donating and accepting polymers, we observed a strict anticorrelation between the relative exciplex emission in the solid state and the photovoltaic efficiency of corresponding blend devices. Thermal annealing led to a decrease in exciplex emission accompanied by an increase in photovoltaic efficiency. Comparative studies on defined bi-layer geometries bilayer devices did not show any influence on the annealing step. Consequently, we conclude that the photocurrent is mainly determined by the efficiency to form free carriers rather than by the transport and free carrier recombination.