Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)

O 29.59: Poster

Mittwoch, 29. März 2006, 14:30–17:30, P2

Electron Transfer Dynamics from Perylene to ZnO Semiconductor: A comparative study between TiO₂ and ZnO — •Charaf Cherkouk, Jodi Szarko, Lars Gundlach, Liana Socaciu-Siebert, Antje Neubauer, and Frank Willig — Hahn-Meitner-Institute, Department: Dynamics of Interfacial Reactions SE4, Glienickerstrasse 100, 14109 Berlin

Heterogeneous electron transfer (ET) between different molecules adsorbed on semiconductor surfaces has been investigated mainly with TiO₂ as the substrate [1,2]. The (10-10) surface of ZnO was used here as a substrate in order to investigate the influence of the nature of the semiconductor on the injection and relaxation dynamics. For both substrates electron transfer and relaxation dynamics were measured using time resolved two-photon photoelectron spectroscopy (TR-2PPE). Angular dependent 2PPE intensity was measured in order to extract information on the orientation of the molecules on the surface of the semiconductor. Others techniques such as XPS, UPS, and LEED were used in addition to characterize the surface of the clean and the dye-covered ZnO (10-10) single crystal surface, respectively. These results are compared with measurements on identical systems using TiO₂ as a substrate.

[1] L. Gundlach, S. Felber, W. Storck, E. Galoppini, Q. Wei, and F. Willig, Res. Chem. Intermed. 31, 39, 2005.

[2] R. Huber, J.-E. Moser, M. Grätzel, and J. Wachtveitl, J. Phys. Chem. B 106, 6494, 2002.