Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 58: Poster Session - Ultrafast Electron Dynamics at Surface and Interfaces

O 58.1: Poster

Tuesday, March 17, 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.