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@ARTICLE{Soubatch:19536,
      author       = {Soubatch, S. and Kröger, I. and Kumpf, C. and Tautz, F.S.},
      title        = {{S}tructure and growth of tetracene on {A}g(111)},
      journal      = {Physical review / B},
      volume       = {84},
      number       = {19},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-19536},
      pages        = {195440},
      year         = {2011},
      note         = {We thank M. Sokolowski (University of Bonn), B. Voigtlander
                      (Forschungszentrum Julich), G. Meyer (IBM Research, Zurich),
                      and S. Folsch (Paul-Drude-Institute, Berlin) for helpful
                      discussion. This work was partially supported by the
                      Deutsche Forschungsgemeinschaft (DFG) via priority program
                      1121 "Organic field effect transistors: structural and
                      dynamic properties" and the project TA244.},
      abstract     = {The structure of the tetracene/Ag(111) interface in the
                      coverage range theta = 0 to 2.4 ML is studied with scanning
                      tunneling microscopy (STM) at 8 K and with low energy
                      electron diffraction (LEED) at T = 300 ... 100 K. For theta
                      less than or similar to 0.01 ML, one-dimensional (1D)
                      diffusion of single molecules along < 01 (1) over bar
                      >-directions is observed even at 8 K. For 0.1 ML < theta <
                      0.5 ML molecules are homogeneously distributed over the
                      surface forming a disordered phase (static at T = 8 K,
                      dynamic at T = 25 K), indicating a repulsive intermolecular
                      interaction (delta-phase). For theta greater than or similar
                      to 0.5 ML, local ordering in the commensurate gamma-phase is
                      observed. Further increase of the coverage yields a
                      compressed monolayer (ML) phase (theta = 1 ML) with
                      point-on-line registry (alpha-phase). The interaction
                      between molecules has been calculated with the force-field
                      approach to rationalize the molecular packing motifs in the
                      various phases. Under most circumstances molecule-molecule
                      interactions are repulsive, in agreement with experimental
                      findings. A simulation of the adsorption up to theta = 1 ML
                      according to the random sequential adsorption (RSA)
                      algorithm shows that the disorder-to-order transition from
                      the delta- to gamma-phase occurs close to random close
                      packing (RCP), theta = 0.5-0.6 ML. Since tetracene molecules
                      are a two-dimensional (2D) representation of Onsager's hard
                      rod model, this suggests that this phase transition is
                      driven both energetically and entropically. For theta
                      approximate to 2.23 ML a metastable bilayer phase with
                      point-on-line coincidence is observed (beta-phase). The
                      basic structural unit of this phase is a triplet of
                      molecules that are tilted along the long molecular axis
                      against each other; at least one of these molecules is
                      tilted out of the surface plane. Within the beta-phase a
                      superstructure of alternating rotation domains is observed.
                      This superstructure has a period of 7.4 nm. The molecular
                      packing in the beta-phase resembles the packing in the bulk
                      crystal structure of tetracene, its formation can therefore
                      be interpreted as incipient pseudomorphic growth of
                      tetracene on Ag(111). However, pseudomorphic growth cannot
                      be continued beyond the beta-phase.},
      keywords     = {J (WoSType)},
      cin          = {PGI-3 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-3-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000296866000012},
      doi          = {10.1103/PhysRevB.84.195440},
      url          = {https://juser.fz-juelich.de/record/19536},
}