Frankfurt 2006 – scientific programme

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MO: Molekülphysik

MO 71: Dynamics and Spectroscopy at Interfaces

MO 71.2: Talk

Friday, March 17, 2006, 10:55–11:10, H12

Structural influence of the dye on the dynamics of ultrafast heterogeneous electron transfer in a dye/semiconductor system — •Antje Neubauer, Lars Gundlach, Liana Socaciu-Siebert, Jodi Szarko, Ralph Ernstorfer, Silke Felber, Guido Morbach, Rainer Eichberger, and Frank Willig — Hahn-Meitner-Institute, Dept. SE4, Glienicker Str. 100, 14109 Berlin, Germany

The organic dye perylene attached via different anchor and spacer groups to TiO₂ surfaces were investigated in order to elucidate the influence of the molecular structure of the dye molecules on the dynamics of ultrafast heterogeneous electron transfer. For the electron transfer, the perylene functions as the electron donor in which the donor state lies above the edge of the conduction band minimum of the acceptor TiO₂. The electron transfer to TiO₂ surfaces has significant importance in the Graetzel cell, a dye-sensitized solar cell. The investigations were performed with two different time-resolved methods. Measurements with two photon photoemission (2PPE) spectroscopy were carried out on a rutile TiO₂ (110) single crystal surface and measurements with transient absorption were done on colloidal films of anatase TiO₂. Both techniques were employed under UHV conditions to avoid the photodecomposition of the perylene chromophore in the presence of water. The results of both methods on different perylene-derivatives at the TiO₂ surfaces will be shown and compared.