Dresden 2011 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 20: Transport and Spectroscopy in Molecular Nanostructures II (related to SYMN, jointly with CPP)

MO 20.8: Vortrag

Donnerstag, 17. März 2011, 12:15–12:30, TOE 317

Novel Multi-Chromophor Light Absorber Concepts for DSSCs for Efficient Electron Injection — •Robert Schütz¹, Christian Strothkaemper¹, Carlo Fasting², Inara Thomas^1,2, Andreas Bartelt¹, Thomas Hannappel¹, and Rainer Eichberger¹ — ¹Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany — ²Institut für Organische Chemie, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany

Dye sensitized solar cells (DSSCs) operate by injecting electrons from the excited state of a light-harvesting dye into the continuum of conduction band states of a wide bandgap semiconductor. The light harvesting efficiency of pure organic dyes is limited by a narrow spectral electronic transition. A beneficial broad ground state absorption in the VIS region can be achieved by applying a single molecular dye system with multiple chromophors involving a Förster resonance energy transfer (FRET) mechanism for an efficient electron injection. A model donor acceptor dye system capable for FRET chemically linked to colloidal TiO₂ and ZnO nanorod surfaces was investigated in UHV environment. We used VIS/NIR femtosecond transient absorption spectroscopy and optical pump terahertz probe spectroscopy to study the charge injection dynamics of the antenna system. Different chromophors attached to a novel scaffold/anchor system connecting the organic absorber unit to the metal oxide semiconductor were probed.