Berlin 2008 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 20: Organic Polymer-Metal Interfaces (SYSA 7)

DS 20.5: Vortrag

Mittwoch, 27. Februar 2008, 19:00–19:15, H 2013

Interface engineering and advanced photon harvesting in organic solar cells — •Robert Koeppe¹, Pavel A. Troshin², Rimma N. Lyubovskaya², and N. Serdar Sariciftci¹ — ¹Linz Institute for Organic Solar Cells (LIOS), JKU Linz — ²Institute of Problems of Chemical Physics, Russian Academy of Science, Chernogolovka

We consider two approaches towards increasing the photon harvesting in low energy gap organic solar cells. These devices usually have a low absorption cross section in the blue and green part of the spectrum, which decreases the quantum efficiency in this range. Both approaches require a tuning of the interfaces between the active materials in the device. Firstly, we use the complexing of a pyrrolidinofullerene with pendant pyridil groups to zinc-phthalocyanine to specifically organize the interfaces in a multicomponent organic solar cell. [P.A. Troshin et al., Chem. Mater. 19, 5363 (2007)] Secondly, we consider the use of CdSe/ZnS semiconductor nanocrystals as energy transfer donors that channel the energy from the absorbed light onto the active material of the solar cell. Here, the ligand shell around the nanocrystals plays an important role to insulate the crystals and still allow energy transfer. The dependence of the energy transfer efficiency on the length of the ligands is determined and a photodiode device made of zinc-phthalocyanine is presented, where the addition of CdSe/ZnS nanocrystals lead to an enhanced sensitivity in the green spectral region. [R. Koeppe et. al., Sol. Energ. Mat. Sol. Cells 91(11), 986 (2007)]