Regensburg 2007 – wissenschaftliches Programm
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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.5: Poster
Dienstag, 27. März 2007, 18:00–20:00, Poster B
Two–Photon Photoemission Spectra of Heterogeneous Electron Transfer — •Dmitry Tsivlin1, Lars Gundlach2, Frank Willig3, and Volkhard May1 — 1Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany — 2Dynamik von Grenzflächenreaktionen, Hahn-Meitner-Institut Berlin, Glienicker Straße 100, 14109 Berlin, Germany — 3Department TH, Fritz-Haber-Institut der MPG, Faradayweg 4-6, 14195 Berlin
Heterogeneous electron transfer from dye molecules into the conduction band continuum of TiO2 has received considerable interest recently. It has been suggested that signatures of vibrational dynamics related to the dye can be distinguished in the photoelectron emission spectra measured shortly after the charge transfer process [1].
In the present study we simulate the time– and energy–resolved spectra of electrons emitted from the TiO2 rutile surface with attached perylene derivatives. The interplay of the molecule and crystal contributions to the spectrum is discussed within a simple tight–binding model. Taking into account the finite escape depth and phonon–induced dephasing of the electrons inside the crystal an interpretation of the experimentally observed non–exponential photoemission signal decay on the femtosecond time–scale is proposed [2].
[1] L. Wang, V.May, R. Ernstorfer, L. Gundlach and F. Willig, Springer Series in Chemical Physics Vol.87 (Springer-Verlag, submitted). [2] L. Gundlach, R. Ernstorfer, and F. Willig, Phys. Rev. B 74, 035324 (2006).