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CPP: Chemische Physik und Polymerphysik

CPP 21: SYMPOSIUM Functional Organic Thin Films II

CPP 21.8: Talk

Thursday, March 30, 2006, 16:15–16:30, ZEU Lich

Energy transfer between zinc-phthalocyanine and CdSe/ZnS nanocrystals for sensitizing organic photovoltaics — •Robert Koeppe, Anita Fuchsbauer, Shengli Lu, and Niyazi Serdar Sariciftci — Linz Institute for Organic Solar Cells (LIOS), Altenbergerstr. 69, A-4040 Linz, Austria

Zinc-phthalocyanine (ZnPc) and C60 is a material combination for the manufacturing of high efficiency thin film organic solar cells [1]. The low absorption coefficient of both materials around 500nm light wavelength where the solar photon flux has its maximum is a loss mechnanism leading to a low quantum efficiency in this range. A Förster energy transfer from a donor absorbing in this wavelength range onto the ZnPc molecule is proposed. As a model system we investigate CdSe/ZnS core-shell nanocrystals as energy transfer donor together with ZnPc as acceptor. In a bilayer configuration we see strong quenching of the nanoparticle luminescence in dependence on the size of the organic ligand shell around the nanocrystals. This distance dependence indicates an effective energy transfer between the nanocrystals and the ZnPc film. [1] D. Wohrle, D. Meissner, Adv. Mater., 3, 129 (1991)