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LMU München
Fakultät für Physik

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Electron transfer to semiconductor surfaces

(Femtochemistry - Femtobiology)

The electron transfer from organic dye molecules into semiconductor nanoparticles is the key feature of novel wet solar cells, as e.g. the Grätzel cell (see http://dcwww.epfl.ch/icp/ICP-2/solarcellE.html for further information). The underlying charge transfer from a system with discrete energy levels into a quasi-continuum of acceptor states is not well understood and represents a theoretical and experimental challenge. The nearly infinite number of acceptor states leads to extremely short transfer times in the range of a few femtoseconds which cannot be resolved by standard femtosecond set-ups.

In our group we developed a pump-probe set-up enabling to directly time resolve these reactions over a broad spectral range (UV-NIR). For the first time the influence of surface states on the transfer process could be demonstrated with this device, further more vibrational coherences and injection times were directly observed.

Previous coworkers:

Josef Wachtveitl
Robert Huber

Publications:

"Beyond vibrationally mediated electron transfer: interfacial charge injection on a sub-10-fs time scale"
Robert Huber; Jacques E. Moser; Michael Gratzel; Josef L. Wachtveitl

Proc. SPIE, 5223, 121 (2007)

Details

"Beyond vibrationally mediated electron transfer: coherent phenomena in a sub-10-femtosecond reaction regime"
R. Huber, J.E. Moser, M. Grätzel, J. Wachtveitl

EQEC 2003, Munich, Germany: IEEE Cat No.03TH8665: 158 (2003)

Details

"Photoinduced electrontransfer in dye/semiconductor systems on a sub-10-fs time scale"
R. Huber, J. E. Moser, M. Grätzel, J. Wachtveitl

Ultrafast Phenomena XIII, Springer, eds. Elsässer, T.; Mukamel, S.;Murnane, M.M.; Scherer, N.F., accepted, (2002)

Details

"Real time Observation of Photoinduced Adiabatic Electron Transfer in Strongly Coupled Dye/Semiconductor Colloidal Systems with a 6 Femtosecond Time Constant"
R. Huber, J.E. Moser, M. Grätzel, J. Wachtveitl

J. Phys. Chem. B 106, 6494-6499 (2002)

Details

"Observation of photoinduced electron transfer in dye/semiconductor colloidal systems with different coupling strengths"
R. Huber, J.E. Moser, M. Graetzel, J. Wachtveitl

Chem. Phys., 285, 39-45 (2002)

Details

"Noncollinear optical parametric amplifiers with output parameters improved by the application of a white light continuum generated in CaF2"
R. Huber, H. Satzger, W. Zinth, J. Wachtveitl

Opt. Commun., 194 443-448 (2001)

Details

"The Role of Surface States in the Ultrafast Photoinduced Electron Transfer from Sensitizing DyeMolecules to Semiconductor Colloids"
R. Huber, S. Spoerlein, J.E. Moser, M. Graetzel, J. Wachtveitl

J. Phys. Chem B, 104, 8995-9003 (2000)

Details

"Surface states control ultrafast electron injection in dye/semiconductor colloidal systems"
R. Huber, S. Spörlein, J. E. Moser, M. Grätzel, J. Wachtveitl

Ultrafast Phenomena XII, (Elsässer, T., Mukamel, S., Murnane, M.M. and Scherer, N.F. eds.), 2000

Details

"Ultrafast photoinduced electron transfer in coumarin 343 sensitized TiO₂-films"
J. Wachtveitl, R. Huber, S. Spörlein, J. E. Moser, M. Grätzel

J. Photoenerg., 1, 153-156 (1999)

Details

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Letzte Änderung: 2024-06-17 21:32