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@PHDTHESIS{Henneke:834675,
author = {Henneke, Caroline},
title = {{K}inetic and thermodynamic considerations on the formation
of heteromolecular layers on metal surfaces},
volume = {149},
school = {RWTH Aachen},
type = {Dr.},
address = {Jülich},
publisher = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
reportid = {FZJ-2017-04578},
isbn = {978-3-95806-245-0},
series = {Schriften des Forschungszentrums Jülich. Reihe
Schlüsseltechnologien / Key Technologies},
pages = {VII, 157, XIV S.},
year = {2017},
note = {RWTH Aachen, Diss., 2015},
abstract = {A systematic study of the growth of a heteromolecular
adsorbate system in the submonolayer regime is presented in
this work. The properties of such systems are determined by
the interplay between molecule-substrate and
molecule-molecule interactions, and hence a careful
selection of molecule on the one hand, and substrates on the
other hand is essential. The molecules PTCDA and CuPc were
chosen as adsorbates since they represent a donor-acceptor
model system for organic electronics. Their intermolecular
interaction is very different in the homomolecular phases
with an attraction between PTCDA molecules and a mostly
repulsive interaction in the case of CuPc. Consequently,
these molecules form compact islands (PTCDA) or a dilute
disordered gas-like phase (CuPc) which enables fundamentally
different ways of preparing the heteromolecular films. Two
different substrates, which were employed to investigate the
influence of the metal-molecule interaction on the growth,
are Ag(111) and Cu(001). The phase diagram of the
heteromolecular PTCDA-CuPc system on Ag(111) at 300K is the
key finding in this work and is discussed in chapter
6.2.3.1. It contains eight different regions with one or two
different crystalline phases which coexist with areas of a
disordered phase of both molecules. Only the disordered
phase is present on the surface in a ninth region. It is
found that the local density of CuPc in the disordered phase
is the decisive parameter for the occurrence of the
different phases. Different phases exist when certain
critical values of the CuPc density are exceeded. A number
of other investigations have also been performed and most of
their results are essential for the understanding of this
phase diagram since its shape is determined by a complex
interplay between different forces. $\textbf{Homomolecular
systems}$ The growth of the homomolecular systems is studied
in the first part of this work since it is impossible to
understand the growth processes of heteromolecular systems
without first understanding the growth of the respective
homomolecular systems. Detailed analyses were performed to
determined the interaction between the molecules and the
molecules and the substrate. The attractive intermolecular
interaction dominates the growth of PTCDA leading to the
growth of crystalline islands already at very low coverages
on both metal sub- strates. The island size distribution and
the island density are used to quantitatively deter- mine
the binding energy between the molecules on Cu(001) to be
1.6 eV which is the energy required to detach one molecules
from a molecular cluster. This high binding[...]},
cin = {PGI-3},
cid = {I:(DE-Juel1)PGI-3-20110106},
pnm = {899 - ohne Topic (POF3-899)},
pid = {G:(DE-HGF)POF3-899},
typ = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
urn = {urn:nbn:de:0001-2017081712},
url = {https://juser.fz-juelich.de/record/834675},
}