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O: Fachverband Oberflächenphysik
O 23: Poster Ultrafast Electron Dynamics
O 23.19: Poster
Montag, 17. März 2025, 18:00–20:00, P2
Ultrafast intra- and interlayer charge transfer at the FePc/WSe2 interface — •Gregor Zinke1, Sebastian Hedwig1, Benito Arnoldi1, Martin Anstett1, Lu Lyu1,2, Martin Aeschlimann1, and Benjamin Stadtmüller1,2 — 1Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern - Landau, Erwin-Schroedinger-Straße 46, 67663 Kaiserslautern, Germany — 2Experimental Physics II, Institute for Physics, University of Augsburg, Universitätsstraße 1, 86159 Augsburg
Tailoring the optoelectronic properties of 2D-van-der-Waals materials by material design is a promising approach for functionalizing charge and spin carriers in low-dimensional materials. In this work, we demonstrate how optically excited ultrafast charge carrier dynamics of TMDCs can be altered by the formation of molecule/2D material heterostructures. Here, we focus on an ordered FePc monolayer film deposited on the surface of a bulk WSe2 crystal. Using time- and angle-resolved photoemission in a VIS-pump, XUV-probe setup, we will elucidate the ultrafast response of the electronic system to an optical excitation on fs-timescales. Of particular interest is the investigation of intra- and interlayer charge carrier dynamics at the FePc / WSe2 interface, which can be disentangled by the characteristic momentum space signatures of the WSe2 Bloch-like states and molecular orbitals. We will further illustrate the impact of ultrafast charge separation across the interface on transient changes of the interfacial energy level alignment.
Keywords: WSe2; ARPES; molecular interface; ultrafast