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@ARTICLE{Stadtmller:280904,
      author       = {Stadtmüller, Benjamin and Willenbockel, Martin and
                      Schröder, Sonja and Kleimann, Christoph and Reinisch, Eva
                      M. and Ules, Thomas and Soubatch, Sergey and Ramsey, Michael
                      G. and Tautz, F. Stefan and Kumpf, Christian},
      title        = {{M}odification of the {PTCDA}-{A}g bond by forming a
                      heteromolecular bilayer film},
      journal      = {Physical review / B},
      volume       = {91},
      number       = {15},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2016-00615},
      pages        = {155433},
      year         = {2015},
      abstract     = {The understanding of the fundamental physical properties of
                      metal-organic and organic-organic interfaces is crucial for
                      improving the performance of organic electronic devices.
                      This is particularly true for (multilayer) systems
                      containing several molecular species due to their relevance
                      for donor-acceptor systems. A prototypical heteromolecular
                      bilayer system is copper-II-phthalocyanine (CuPc) on
                      3,4,9,10-perylene-tetra-carboxylic-dianhydride (PTCDA) on
                      Ag(111). In an earlier work we have reported a commensurate
                      registry between both organic layers and an enhanced charge
                      transfer from the Ag substrate into the organic bilayer film
                      [Phys. Rev. Lett. 108, 106103 (2012)], which both indicate
                      an unexpectedly strong intermolecular interaction across the
                      organic-organic interface. Here we present new details
                      regarding electronic and geometric structure for the same
                      system. In particular, we provide evidence that the enhanced
                      charge transfer from the substrate into the organic bilayer
                      does not involve CuPc electronic states, hence, there is no
                      significant charge transfer into the second organic layer.
                      Furthermore, we report vertical bonding distances revealing
                      a shortening of the PTCDA-Ag(111) distance upon CuPc
                      adsorption. Thus, electronic and geometric properties
                      (charge transfer and bonding distance, respectively) both
                      indicate a strengthening of the PTCDA-Ag(111) bond upon CuPc
                      adsorption. We explain these findings—in particular the
                      correlation between CuPc adsorption and increased charge
                      transfer into PTCDA—in a model involving an intermolecular
                      screening mechanism.},
      cin          = {PGI-3 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-3-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {141 - Controlling Electron Charge-Based Phenomena
                      (POF3-141)},
      pid          = {G:(DE-HGF)POF3-141},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000353544200003},
      doi          = {10.1103/PhysRevB.91.155433},
      url          = {https://juser.fz-juelich.de/record/280904},
}