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@ARTICLE{Hollerer:837318,
      author       = {Hollerer, Michael and Lüftner, Daniel and Hurdax, Philipp
                      and Ules, Thomas and Soubatch, Serguei and Tautz, Frank
                      Stefan and Koller, Georg and Puschnig, Peter and Sterrer,
                      Martin and Ramsey, Michael G.},
      title        = {{C}harge {T}ransfer and {O}rbital {L}evel {A}lignment at
                      {I}norganic/{O}rganic {I}nterfaces: {T}he {R}ole of
                      {D}ielectric {I}nterlayers},
      journal      = {ACS nano},
      volume       = {11},
      number       = {6},
      issn         = {1936-086X},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2017-06283},
      pages        = {6252 - 6260},
      year         = {2017},
      abstract     = {It is becoming accepted that ultrathin dielectric layers on
                      metals are not merely passive decoupling layers, but can
                      actively influence orbital energy level alignment and charge
                      transfer at interfaces. As such, they can be important in
                      applications ranging from catalysis to organic electronics.
                      However, the details at the molecular level are still under
                      debate. In this study, we present a comprehensive analysis
                      of the phenomenon of charge transfer promoted by a
                      dielectric interlayer with a comparative study of pentacene
                      adsorbed on Ag(001) with and without an ultrathin MgO
                      interlayer. Using scanning tunneling microscopy and
                      photoemission tomography supported by density functional
                      theory, we are able to identify the orbitals involved and
                      quantify the degree of charge transfer in both cases.
                      Fractional charge transfer occurs for pentacene adsorbed on
                      Ag(001), while the presence of the ultrathin MgO interlayer
                      promotes integer charge transfer with the lowest unoccupied
                      molecular orbital transforming into a singly occupied and
                      singly unoccupied state separated by a large gap around the
                      Fermi energy. Our experimental approach allows a direct
                      access to the individual factors governing the energy level
                      alignment and charge-transfer processes for molecular
                      adsorbates on inorganic substrates.},
      cin          = {PGI-3 / JARA-FIT},
      ddc          = {540},
      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:000404808000107},
      pubmed       = {pmid:28541656},
      doi          = {10.1021/acsnano.7b02449},
      url          = {https://juser.fz-juelich.de/record/837318},
}