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@PHDTHESIS{Schnauer:568244,
      author       = {Schönauer, Kathrin},
      othercontributors = {Tautz, Frank Stefan and Jakob, Peter},
      title        = {{S}tructural and electronic investigations on homo- and
                      hetero-organic layers involving {C}u{P}c on silver single
                      crystal surfaces},
      volume       = {116},
      school       = {RWTH Aachen},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH, Zentralbibliothek},
      reportid     = {RWTH-2016-01168},
      isbn         = {978-3-95806-112-5},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Schlüsseltechnologien},
      pages        = {1 Online-Ressource (x, 148 Seiten) : Illustrationen,
                      Diagramme},
      year         = {2015},
      note         = {Druckausgabe: 2015. - Onlineausgabe: 2015. - Auch
                      veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University 2016; Dissertation, RWTH Aachen, 2015},
      abstract     = {In this work we investigate variations of a homo-molecular
                      layer of CuPc adsorbed onthe Ag(111) surface, which is a
                      well known example in research on organic electronicswhere
                      the structural and electronic properties at the
                      metal-organic interface are of interest.Three modifications
                      of the mentioned system are realized by addition of a
                      secondlayer, exchange of the substrate, and addition of a
                      second type of organic molecules.Measurements on the lateral
                      structure are performed by STM and LEED. For experimentson
                      the electronic structure, STM-based differential conductance
                      spectroscopy andangle-resolved PES are applied.For a second
                      layer of CuPc on top of the first layer of CuPc on Ag(111)
                      we observe aweaker interaction between the two molecular
                      layers than between the substrate and thefirst molecular
                      layer. This allows molecules in the second layer to adsorb
                      in an inclinedconfiguration in contrast to the flat lying
                      geometry of molecules in the first layer. TheHOMO of CuPc
                      shifts towards larger binding energies with increasing
                      coverage. The(former) LUMO, which in the first layer is
                      weakly occupied by charge donation fromthe silver substrate,
                      is unoccupied in the second layer because of a significantly
                      weakerinteraction with the underlying material.Experiments
                      on a dense, closed layer of CuPc molecules on the Ag(110)
                      surface reveala stronger effect of this substrate on the
                      layer formation than the Ag(111) surface.The stronger
                      interacting substrate of lower symmetry dominates the
                      formation of thelateral molecular arrangement interspersed
                      by dislocation lines where the intermolecularinteraction
                      breaks through. The initially 4-fold symmetry of the
                      molecules is reduced to2-fold due to a combination of
                      geometric and electronic effects. The part of the
                      moleculethat is is aligned with a more acute angle to the
                      Ag[001] direction is slightly bent down,interacting stronger
                      with the substrate and receiving charge donated by the
                      silver. Bythis asymmetry the original degeneracy of the two
                      parts of the LUMO is lifted.Laterally mixed hetero-organic
                      layers of CuPc and PTCDA on Ag(110) show thestronger
                      influence of the substrate on the formation of ordered
                      structures compared tomixed ordered layers on Ag(111). A
                      tendency to form complex packing motifs is observedand we
                      investigate two different structures that are described by
                      large unit cells comprising5 and 9 molecules, respectively.
                      Measurements on the local electronic structure aredominated
                      by signals from PTCDA molecules and we observe that the
                      PTCDA LUMOis occupied to at least the same degree as it is
                      in a homo-molecular PTCDA layer. TheCuPc LUMO is unoccupied
                      indicating a molecule-molecule interaction with an
                      unequalcharge distribution for the two types of molecules.},
      cin          = {134110 / 130000},
      ddc          = {621.3},
      cid          = {$I:(DE-82)134110_20140620$ / $I:(DE-82)130000_20140620$},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:hbz:82-rwth-2016-011686},
      url          = {https://publications.rwth-aachen.de/record/568244},
}