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@PHDTHESIS{Kowalzik:14153,
author = {Kowalzik, Peter},
title = {{S}ubstituted coronenes for molecular electronics: {F}rom
supramolecular structures to single molecules},
volume = {16},
school = {RWTH Aachen},
type = {Dr. (Univ.)},
address = {Jülich},
publisher = {Forschungszentrum Jülich},
reportid = {PreJuSER-14153},
isbn = {978-3-89336-679-8},
series = {Schriften des Forschungszentrums Jülich. Reihe Information
/ Information},
pages = {IX, 149 S.},
year = {2010},
note = {Record converted from JUWEL: 18.07.2013; RWTH Aachen,
Diss., 2010},
abstract = {The ongoing miniaturization of silicon integrated circuits
makes the understanding of the electronic properties of
nanoscale structures and the exploration of novel materials
and device concepts more and more important. One promising
approach to construct future electronic systems is the usage
of organic molecules and utilizing their ability to
self-assemble and/or taking advantage of the possibility to
achieve various electronic functions just by modifying their
chemical structures. This thesis explores a highly
conjugated molecular system, namely dodecakis(arylthio)-
coronenes (DATCs), with a view to potential applications as
molecular electronic building blocks. The techniques of
scanning tunneling microscopy and spectroscopy are applied
to characterize the structural and the electronic properties
of monolayers of these molecules on metal surfaces.
Variations of the substituents allowed to specifically
affect the self-assembly of the molecules. Supramolecular
structures with different orientations of the molecules
relative to the substrate and with different intermolecular
interactions are obtained. The growth of highly ordered
supramolecular chains is observed in the case of the basic
molecular building block dodecakis(phenylthio)coronene
(Cor-H) on Au(111) surfaces. The formation of delocalized
electronic states along the chains suggests the potential of
this system as a basis for novel organic materials with
anisotropic charge transport properties. Substituents with
varying electron-accepting or electron-donating ability are
used to modify Cor-H and enhance or prevent the molecular
stacking. Assemblies of molecules with molecular quantum dot
behavior can also be obtained in this way. The tailored
functionalization allows a decoupling of the aromatic system
of the molecules from the substrate states, which in turn
leads to the occurrence of single electron tunneling
effects. Different substitutions of the DATC system can thus
be used to create desired electronic functions. Furthermore,
several fabrication routs for nanoscale electrode structures
were worked out to “wire up” single molecules in a
device-like configuration and to investigate their
electrical properties. In particular, the technique of
electron-beam lithography in conjunction with unconventional
nanofabrication methods like electromigration were utilized
to fabricate nanometer-spaced metal electrodes. Such
nanopatterns additionally allowed to characterize the charge
transport through embedded single molecules.},
cin = {IFF-6 / JARA-FIT},
ddc = {500},
cid = {I:(DE-Juel1)VDB786 / $I:(DE-82)080009_20140620$},
pnm = {Grundlagen für zukünftige Informationstechnologien},
pid = {G:(DE-Juel1)FUEK412},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
url = {https://juser.fz-juelich.de/record/14153},
}