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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 2: Organic Photovoltaics: from Single Molecules to Devices

SYOP 2.3: Hauptvortrag

Donnerstag, 26. März 2009, 10:30–11:00, BAR SCHÖ

Charge Carrier Dissociation and Recombination in Polymer Solar Cells — •Vladimir Dyakonov^1,2 and Carsten Deibel¹ — ¹Julius-Maximilians University Würzburg, Institute of Physics, Experimental Physics VI, 97074 Würzburg, Germany — ²Bavarian Center for Applied Energy Research e.V. (ZAE Bayern), 97074 Würzburg, Germany

We determined the dominant polaron recombination loss mechanisms in pristine and annealed polythiophene:fullerene blend solar cells by applying the photo-induced charge extraction by linearly increasing voltage (photo-CELIV). In pristine samples, we find a strongly temperature dependent bimolecular polaron recombination rate, which is strongly reduced as compared to the Langevin theory. For the annealed sample, we observe a polaron decay rate which follows a third order of carrier concentration almost temperature independently. We will discuss the impact of a reduced bimolecular recombination rate on the main characteristics of the polymer solar cells.