Dresden 2020 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Session - Ultrafast Electron Dynamics at Surface and Interfaces
O 58.1: Poster
Dienstag, 17. März 2020, 18:15–20:00, P2/2OG
Photoinduced charge carrier dynamics and electron injection efficiencies in Au nanoparticle-sensitized TiO2 determined with picosecond time-resolved X-ray photoelectron spectroscopy — Mario Borgwardt1, Johannes Mahl1, •Friedrich Roth2, Lukas Wenthaus3, Felix Brausse1, Monika Blum4, Klaus Schwarzburg5, Guiji Liu6, Francesca M. Toma6, Wolfgang Eberhardt3, and Oliver Gessner1 — 1Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA — 2Institute of Experimental Physics, TU Bergakademie Freiberg, Leipziger Straße 23, D-09599 Freiberg, Germany — 3Center for Free-Electron Laser Science / DESY, D-22607 Hamburg, Germany — 4Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States — 5Institute for Solar Fuels, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 14109, Berlin, Germany — 6Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, California 94720, USA
We employ picosecond time-resolved x-ray photoemission spectroscopy to investigate photoinduced electron transfer in a plasmonic model system composed of 20 nm sized gold nanoparticles (NPs) attached to a nanoporous film of TiO2. The measurement provides direct, quantitative access to transient local charge distributions selectively from the perspectives of the electron donor (AuNP) and electron acceptor (TiO2). Back electron transfer from the perspective of AuNP is dominated by a fast recombination channel proceeding on a timescale of 60±10 ps and a minor contribution that is completed after ≈ 1 ns.