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SKM-SYOP: SKM-Symposium Elementary Processes in Organic Photovoltaics

SKM-SYOP 1: Elementary Processes in Organic Photovoltaics

SKM-SYOP 1.5: Hauptvortrag

Montag, 14. März 2011, 12:30–13:00, TRE Ma

Efficient and stable organic vacuum deposited p-i-n-type tandem solar cells — •Martin Pfeiffer — Heliatek GmbH, Dresden, Germany

We report on latest progress in the field of p-i-n type tandem solar cells. An efficiency of 8.3% on an active area of 1cm* has been confirmed by Fraunhofer ISE for a tandem cell where both photoactive layers are based on bulk-heterojunctions comprising a donor-type oligomer co-deposited with fullerene C60. We discuss the remaining loss factors in the present system and the way towards further optimization. Moreover, we show that p-i-n type tandem solar cells can be extremely stable: Extrapolated lifetimes corresponding to more than twenty years of illumination have been achieved for cells with an initial efficiency of 6%. Moreover, we report on efficient modules with integrated series interconnection. Finally, we show that high efficiencies (above 6% on 1cm^2) and lifetimes (several thousand hours both in a light-soaking test and when stored at 85°C) can be achieved for p-i-n tandem cells prepared on PET foil.