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@ARTICLE{Stadtmller:826072,
author = {Stadtmüller, Benjamin and Haag, Norman and Seidel,
Johannes and van Straaten, Gerben and Franke, Markus and
Kumpf, Christian and Cinchetti, Mirko and Aeschlimann,
Martin},
title = {{A}dsorption heights and bonding strength of organic
molecules on a {P}b-{A}g surface alloy},
journal = {Physical review / B},
volume = {94},
number = {23},
issn = {2469-9950},
address = {Woodbury, NY},
publisher = {Inst.},
reportid = {FZJ-2017-00332},
pages = {235436},
year = {2016},
abstract = {The understanding of the fundamental geometric and
electronic properties of metal-organic hybrid interfaces is
a key issue on the way to improving the performance of
organic electronic and spintronic devices. Here, we studied
the adsorption heights of copper-II-phthalocyanine (CuPc)
and 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) on
a Pb1Ag2 surface alloy on Ag(111) using the normal-incidence
x-ray standing waves technique. We find a significantly
larger adsorption height of both molecules on the Pb-Ag
surface alloy compared to the bare Ag(111) surface which is
caused by the larger size of Pb. This increased adsorption
height suppresses the partial chemical interaction of both
molecules with Ag surface atoms. Instead, CuPc and PTCDA
molecules bond only to the Pb atoms with different
interaction strength ranging from a van der Waals–like
interaction for CuPc to a weak chemical interaction with
additional local bonds for PTCDA. The different adsorption
heights for CuPc and PTCDA on Pb1Ag2 are the result of local
site-specific molecule-surface bonds mediated by functional
molecular groups and the different charge donating and
accepting character of CuPc and PTCDA.},
cin = {PGI-3 / JARA-FIT},
ddc = {530},
cid = {I:(DE-Juel1)PGI-3-20110106 / $I:(DE-82)080009_20140620$},
pnm = {142 - Controlling Spin-Based Phenomena (POF3-142)},
pid = {G:(DE-HGF)POF3-142},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000391010200009},
doi = {10.1103/PhysRevB.94.235436},
url = {https://juser.fz-juelich.de/record/826072},
}