Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 78: Electronic Structure of Surfaces I: Photoelectron Spectroscopy
O 78.8: Vortrag
Donnerstag, 4. April 2019, 12:30–12:45, H14
Electronic properties of Cobalt-Pyrphyrin on Cu2O(111) - A model electrode for photocatalytic water splitting — •Lisa Grad, Adrian Schuler, Matthias Hengsberger, and Jürg Osterwalder — University of Zurich, Physics Institute, Winterthurerstrasse 190, 8057 Zurich, Switzerland
Photocatalytic water splitting represents a sustainable way to store solar energy in the form of chemical bonds. For large-scale use, the combination of molecular catalysts supported on light absorbing substrates is a viable approach.
With photoemission experiments we investigate the electronic pro-perties of one model cathode consisting of the metalorganic molecule Cobalt-Pyrphyrin (CoPyr) adsorbed on the Cu2O(111) surface. Due to its small band gap Cu2O(111) is an efficient photoabsorber for solar light. Further it is a p-type semiconductor with downward band bending towards the surface. With angle-resolved X-ray photoelectron spectroscopy the band bending close to the surface could be determined before and after the adsorption of CoPyr molecules.
The related electric field leads to charge separation of photo-generated electron-hole pairs. By means of time-resolved two-photon photoemission we could determine the relaxation dynamics and the lifetime of photo-excited electrons in the conduction band of pristine Cu2O(111).
Our current work is focused on the investigation of the energy level alignment, the charge injection into and the lifetime of electrons in the molecular states of CoPyr adsorbed on Cu2O(111).