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Tuning ultrafast electron injection dynamics at organic-graphene/metal interfaces

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Abstract

We compare the ultrafast charge transfer dynamics of molecules on epitaxial graphene and bilayer graphene grown on Ni(111) interfaces through first principles calculations and X-ray resonant photoemission spectroscopy. We use 4,4′-bipyridine as a prototypical molecule for these explorations as the energy level alignment of core-excited molecular orbitals allows ultrafast injection of electrons from a substrate to a molecule on a femtosecond timescale. We show that the ultrafast injection of electrons from the substrate to the molecule is ∼4 times slower on weakly coupled bilayer graphene than on epitaxial graphene. Through our experiments and calculations, we can attribute this to a difference in the density of states close to the Fermi level between graphene and bilayer graphene. We therefore show how graphene coupling with the substrate influences charge transfer dynamics between organic molecules and graphene interfaces.

Graphical abstract: Tuning ultrafast electron injection dynamics at organic-graphene/metal interfaces

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Publication details

The article was received on 22 Nov 2017, accepted on 23 Mar 2018 and first published on 26 Mar 2018


Article type: Paper
DOI: 10.1039/C7NR08737C
Citation: Nanoscale, 2018, Advance Article
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    Tuning ultrafast electron injection dynamics at organic-graphene/metal interfaces

    A. Ravikumar, G. Kladnik, M. Müller, A. Cossaro, G. Bavdek, L. L. Patera, D. Sánchez-Portal, L. Venkataraman, A. Morgante, G. P. Brivio, D. Cvetko and G. Fratesi, Nanoscale, 2018, Advance Article , DOI: 10.1039/C7NR08737C

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