Berlin 2005 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 20: Dynamics II

CPP 20.4: Talk

Tuesday, March 8, 2005, 12:00–12:15, TU C230

The Perylene TiO₂ System: Analysis of a Heterogeneous Electron Transfer Reacation — •Luxia Wang¹, Ralph Ernstorfer², Frank Willig², and Volkhard May¹ — ¹Institut für physik, Humboldt Universität zu Berlin, Newtonstraβe 15, D-12489 Berlin — ²Hahn-Meitner-Institut, Abteilung Dynamik von Genzflächenreaktionen Glienicher Str. 100, 14109 Berlin

To understand details of heterogeneous electron transfer reactions is of huge importance for the development of photo–voltaic devices. We report on recent experimental as well as theoretical results on photoinduced ultrafast charge injection from perylene into empty (conduction band like) states of TiO₂ nanocrystals. Concentrating on the influence of different anchor groups which fix the dye at the TiO₂ surface a consistent understanding of cw–absorption spectra as well as of femtosecond transient absorption could be achieved [1]. The rather unique model obtained in this way is used to suggest femtosecond laser pulse control of the charge injection process [2].

[1] L. Wang, R. Ernstorfer, F. Willig, and V. May, J. Phys. Chem. B (in press).

[2] L. Wang and V. May, J. Chem. Phys. 121, 8039 (2004).