Regensburg 2019 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 12: HL Poster I
HL 12.44: Poster
Monday, April 1, 2019, 17:30–20:00, Poster E
Probing energy transfer in TMDC/organic heterostructures using Femtosecond Electron Diffraction — •Helene Seiler1, Daniela Zahn1, Soohyung Park2, Thomas Vasileiadis1, YingPeng Qi1, Norbert Koch2, and Ralph Ernstorfer1 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany — 2Department of Physics, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 6, 12489 Berlin, Germany
Transition metal dichalcogenide (TMDC)/organic heterostructures have recently gained attention for their potential in opto-electronic applications. While first devices have been demonstrated, a microscopic understanding of the couplings within the sub-systems as well as between the sub-systems in the heterostructure is still lacking. Here we show how femtosecond electron diffraction can provide direct insights into these couplings using a MoS2/pentacene heterostructure as an example. Our measurements complement optical studies by revealing the energy relaxation pathways dominated by the participation of dark states and incoherent phonons, both not directly accessible with optics. The presented method is general and we expect that it can be applied to a wide range of heterostructures.