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Download fileInvestigation of Ultrathin Layers of Bis(phthalocyaninato)lutetium(III) on Graphite
journal contribution
posted on 2012-04-12, 00:00 authored by Lars Smykalla, Pavel Shukrynau, Michael HietscholdWe present a comprehensive study of the adsorption of
bis(phthalocyaninato)lutetium(III)
(LuPc2) on highly oriented pyrolytic graphite(0001) (HOPG).
The growth and self-assembly of the molecular layers as well as the
electronic structure has been investigated systematically using scanning
tunneling microscopy and scanning tunneling spectroscopy combined
with density functional theory (DFT) calculations and molecular mechanics
simulations. We reveal that the adsorption of LuPc2 leads
to the formation of a square-like close-packed structure on the almost
inert surface of HOPG, which is corroborated by simulations. Moreover,
we observed a parallel orientation of the LuPc2 molecules
in the first monolayer, whereas in subsequent layers an increasing
tilt out of the surface plane was found. Tip–sample distance-dependent
tunneling spectroscopy measurements allowed us to detect a shift in
the energy positions of the peaks assigned to the lowest unoccupied
molecular orbital toward the Fermi energy with decreasing tip–sample
separation.