Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 44: Postersession II

DS 44.7: Poster

Donnerstag, 23. März 2017, 17:00–19:00, P1C

Surface functionalization of WSe₂ by F₁₆CoPc — •Tom Klaproth, Florian Rückerl, Roman Schuster, Bernd Büchner, and Martin Knupfer — Leibniz Institute for Solid State and Materials Research Dresden, Institute for Solid State Research, Helmholtzstraße 20, D-01069 Dresden, Germany

We have investigated the electronic properties of WSe₂ surfaces covered by fluorinated cobalt phthalocyanine (F₁₆CoPc) using photoemission spectroscopy. We show that a charge transfer occurs at this interface, which results in the creation of holes in the WSe₂ surface while the Co center of the phthalocyanine is reduced to Co(I). We observe a potential change in WSe₂ approaching the surface as a consequence of the induced positive charges near the surface. In addition, our data allow for a rough estimation of the induced charge density and suggest that the holes might be localized.