Dresden 2011 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 42: Poster I: Progress in Micro- and Nanopatterning: Techniques and Applications (jointly with O); Spins in Organic Materials; Ion Interactions with Nano Scale Materials; Organic Electronics and Photovoltaics; Plasmonics and Nanophotonics (jointly with HL and O); High-k and Low-k Dielectrics (jointly with DF); Organic Thin Films; Nanoengineered Thin Films; Layer Deposition Processes; Layer Properties: Electrical, Optical, and Mechanical Properties; Thin Film Characterisation: Structure Analysis and Composition; Application of Thin Films
DS 42.24: Poster
Mittwoch, 16. März 2011, 15:00–17:30, P1
SXPS characterization of a donor / acceptor hetero junction for organic solar cells: High photovoltage at the merocyanine / fullerene interface — Eric Mankel, •Philip Reckers, Ludmila Konrad, Corinna Hein, Thomas Mayer, and Wolfram Jaegermann — Technische Universität Darmstadt, Materials Science Institute, Surface Science Division, Petersenstraße 32, 64287 Darmstadt, Germany
Novel absorber molecules are investigated for high efficient organic solar cells. Especially merocyanines provide high photovoltages as donor materials in photoactive organic hetero junction cells. The electronic alignment of a merocyanine / fullerene hetero junction is presented. The band diagram was determined by synchrotron induced photoelectron spectroscopy on in situ stepwise deposited fullerene on a merocyanine layer using the TGM7 dipole beamline at Bessy II. The merocyanine / fullerene HOMO offset is determined to be 850meV leading to a high LUMO offset, the driving force for exciton splitting. In situ bias illumination of the interface with 150W/m2 of a halogen lamp leads to a reversible shift of the C60 emission features of about 800meV, indicating a high photovoltage. The height of the photovoltage depends on the fullerene layer thickness. It starts at 200mV for submonolayer coverage and increases up to approximately 1V for coverages of some ten nanometers.