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MO: Fachverband Molekülphysik

MO 1: Quantum Control and Femtosecond Spectroscopy 1

MO 1.7: Vortrag

Montag, 29. Februar 2016, 12:30–12:45, f102

Capturing Charge Transfer Dynamics at Dye - Semiconductor Interfaces by Means of Ultrafast XUV Photoelectron Spectroscopy — •Mario Borgwardt¹, Martin Wilke¹, Leone Spiccia², Kathrin M. Lange³, Igor Yu. Kiyan¹, and Emad F. Aziz¹ — ¹Institute of Methods for Material Development, Helmholtz-Zentrum Berlin, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany — ²School of Chemistry and ARC Centre of Excellence for Electromaterials Science (ACES), Monash University, Clayton 3800, VIC, Australia — ³Institute of Solar Fuels, Helmholtz-Zentrum Berlin, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany

We present time-resolved XUV photoelectron spectroscopy as a tool to investigate the ultrafast charge transfer processes at the interface between Ru polypyridyl complexes and various semiconductor nanoparticles. To monitor the electron density distribution among the ground as well as the excited states at the interface XUV light from high-order harmonic generation is used as a probe after exposure with a pump laser pulse in the visible wavelength range. With this approach, we identified for the first time directly the absolute binding energies of the involved charge-transfer states and could provide a comprehensive characterization of the analyzed interfaces. [1] The advantage of studying simultaneously injection kinetics and the electronic structure will be discussed and an outlook for future applications of this method in view of other promising energy related materials will be presented.

[1] Borgwardt, M. et al. J. Phys. Chem. C 2015, 119 (17), 9099-9107.