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@PHDTHESIS{Willenbockel:189604,
      author       = {Willenbockel, Martin},
      title        = {{I}nteracting {I}nteractions: {A} {S}tudy on the
                      {I}nterplay of {M}olecule-{M}olecule and
                      {M}olecule-{S}ubstrate {I}nteractions at {M}etal-{O}rganic
                      {I}nterfaces},
      volume       = {99},
      school       = {RWTH Aachen},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2015-02741},
      isbn         = {978-3-95806-018-0},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Schlüsseltechnologien / Key Technologies},
      pages        = {IX, 245 S.},
      year         = {2014},
      note         = {RWTH Aachen, Diss., 2014},
      abstract     = {In this work a surface science study on metal-organic
                      interfaces is presented to resolve their geometric and
                      electronic properties and study the interplay of molecule
                      molecule and molecule-substrate interactions. The organic
                      molecules benzene, azobenzene,
                      3,4,9,10-perylenetetracarboxylic acid dianhydride (PTCDA),
                      and terephthalicacid (TPA) are deposited on low index Ag and
                      Cu surfaces to form monolayer andsub-monolayer structures
                      which are investigated by normal incidence X-ray standing
                      waves and angle resolved photoemission spectroscopy, which
                      leads to several surprising findings. Investigating the
                      adsorption of benzene, we find it physisorbed in a flat
                      geometry for benzene on Ag(111). Enhancing the
                      molecule-substrate interaction by exchanging Ag(111) with
                      the stronger interacting Cu(111) is expected to simply lower
                      the adsorption height. However, we find flat molecules at an
                      elevated adsorption height forbenzene/Cu(111), which seem to
                      be stabilized via intermolecular interactions due to the
                      coexistence with upright standing benzene molecules. The
                      interplay of molecule-molecule and molecule-substrate
                      interactions is further explored on a metal-organic network
                      formed by codeposition of TPA and Fe atoms on Cu(100). The
                      coordination of TPA molecules by the Fe atoms reduces the
                      TPA substrate interaction. An additional sitespecific
                      adsorption of oxygen again alters this balance. In case of
                      PTCDA a comprehensive study for its adsorption on low index
                      Ag surfacesis presented. From linking the geometric and
                      electronic stucture properties, it is understood that the
                      electron density spill-out of the surface and its uptake by
                      the adsorbing molecule is a decisive molecule-substrate
                      interaction channel. This explains the finding that the
                      resulting binding energies of the lowest unoccupied
                      molecular orbital (LUMO) as well as the adsorption height of
                      PTCDA on Ag are determined by the work function. Moving to
                      the archetypal molecular switch azobenzene, which is studied
                      on Cu(111), three different azobenzene monolayer phases
                      which are formed along with a coverage dependent
                      dissociation of the molecule are revealed. The higher the
                      density of molecules get, the stronger molecule-molecule
                      interactions become and force the molecule to bend. However,
                      its strong molecule-substrate bond prevents a conformational
                      change and the resulting stress ultimately leads to a
                      dissociation. The surprising results of this work show that
                      the understanding of interactions at metal-organic
                      interfaces is still only rudimentary and stress the
                      importance of further fundamental research.},
      keywords     = {Dissertation (GND)},
      cin          = {PGI-3 / ZEA-2},
      cid          = {I:(DE-Juel1)PGI-3-20110106 / I:(DE-Juel1)ZEA-2-20090406},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/189604},
}