Surface modification of ZnO(0001)-Zn with phosphonate-based self-assembled monolayers: Binding modes, orientation, and work function (Articolo in rivista)

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  • Surface modification of ZnO(0001)-Zn with phosphonate-based self-assembled monolayers: Binding modes, orientation, and work function (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/cm502171m (literal)
Alternative label
  • Timpel, Melanie; Nardi, Marco Vittorio; Krause, Stefan; Ligorio, Giovanni; Christodoulou, Chris N.; Pasquali, Luca; Giglia, Angelo; Frisch, Johannes; Wegner, Berthold; Moras, Paolo; Koch, Norbert (2014)
    Surface modification of ZnO(0001)-Zn with phosphonate-based self-assembled monolayers: Binding modes, orientation, and work function
    in Chemistry of materials
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Timpel, Melanie; Nardi, Marco Vittorio; Krause, Stefan; Ligorio, Giovanni; Christodoulou, Chris N.; Pasquali, Luca; Giglia, Angelo; Frisch, Johannes; Wegner, Berthold; Moras, Paolo; Koch, Norbert (literal)
Pagina inizio
  • 5042 (literal)
Pagina fine
  • 5050 (literal)
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  • http://www.scopus.com/record/display.url?eid=2-s2.0-84907993678&origin=inward (literal)
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  • 26 (literal)
Rivista
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  • 17 (literal)
Note
  • Scopu (literal)
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  • Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin, Germany Istituto di Struttura della Materia and Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche, Area Science Park, SS. 14 Km 163.5, 34149 Basovizza, Trieste, Italy Engineering Department \"E. Ferrari\", University of Modena e Reggio Emilia, Via Vignolese 905, 41125 Modena, Italy Department of Physics, University of Johannesburg, PO Box 524, Auckland Park 2006, South Africa (literal)
Titolo
  • Surface modification of ZnO(0001)-Zn with phosphonate-based self-assembled monolayers: Binding modes, orientation, and work function (literal)
Abstract
  • We used partially fluorinated alkyl and aromatic phosphonates as model systems with similar molecular dipole moments to form self-assembled monolayers (SAMs) on the Zn-terminated ZnO(0001) surface. The introduced surface dipole moment allows tailoring the ZnO work function to tune the energy levels at the inorganic-organic interface to organic semiconductors, which should improve the efficiency of charge injection/extraction or exciton dissociation in hybrid electronic devices. By employing a wide range of surface characterization techniques supported by theoretical calculations, we present a detailed picture of the phosphonates' binding to ZnO, the molecular orientation in the SAM, their packing density, as well as the concomitant work function changes. We show that for the aromatic SAM the interaction between neighboring molecules is strong enough to drive the formation of a more densely packed monolayer with a higher fraction of bidentate binding to ZnO, whereas for the alkyl SAM a lower packing density was found with a higher fraction of tridentate binding. (literal)
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