Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 67: Ultrafast Electron Dynamics II

O 67.7: Talk

Wednesday, March 19, 2025, 16:30–16:45, H11

Direct view on ultrafast charge transfer between C60 molecules and graphene — •Michael Herb, Maria-Elisabeth Federl, and Isabella Gierz — University of Regensburg

Interfacing 0D molecules with 2D materials holds great potential for various applications in materials science, electronics, and nanotechnology. For example, C60/graphene hybrids have been proposed to serve as supercapacitors or sensitive UV-visible photodetectors. We use time- and angle-resolved photoemission spectroscopy (trARPES) to investigate the interfacial non-equilibrium charge carrier dynamics of a sub-monolayer C60 film deposited on single-layer graphene. Upon excitation below the HOMO-LUMO gap of C60, we observe a shift of the graphene Dirac cone towards higher binding energies and a concurrent shift of the C60 molecular levels towards lower binding energies. These shifts indicate a photoinduced hole doping of graphene that persists for several picoseconds. Based on these findings we propose a possible microscopic pathway for ultrafast charge transfer across the C60-graphene interface.

Keywords: all-carbon; graphene; C60; ultrafast; ARPES