Bis(triisopropylsilylethynyl)pentacene/Au (111) Interface: Coupling, Molecular Orientation and Thermal Stability (Abstract/Poster in convegno)

Type
Label
  • Bis(triisopropylsilylethynyl)pentacene/Au (111) Interface: Coupling, Molecular Orientation and Thermal Stability (Abstract/Poster in convegno) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Alternative label
  • Andrea Gnoli, Hande Ustunel, Daniele Toffoli, Liyang Yu, Daniele Catone, Stefano Turchini, Silvano Lizzit, Natalie Stingelin, Rosanna Larciprete, GianLuca Latini (2014)
    Bis(triisopropylsilylethynyl)pentacene/Au (111) Interface: Coupling, Molecular Orientation and Thermal Stability
    in Workshop Photovoltaics: New frontiers and applications, Lecce, 16-17-18/10/2014
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Andrea Gnoli, Hande Ustunel, Daniele Toffoli, Liyang Yu, Daniele Catone, Stefano Turchini, Silvano Lizzit, Natalie Stingelin, Rosanna Larciprete, GianLuca Latini (literal)
Pagina inizio
  • 41 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://photovoltaicsworkshop.dhitech.it/wp-content/uploads/2014/10/book-of-abstracts.pdf (literal)
Note
  • Poster (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR-ISC Area Tor Vergata Roma, Department of Physics Middle East Technical University Ankara Turkey, Department of Chemistry Middle East Technical University Ankara Turkey, King Abdullah University of Science and Technology Thuwal 23955-6900 Kingdom of Saudi Arabia, CNR-ISM Area Tor Vergata Roma, CNR-ISM Area Tor Vergata Roma, Department of Materials Imperial College London SW7 2AZ London United Kingdom, CNR-ISC Area Tor Vergata Roma (literal)
Titolo
  • Bis(triisopropylsilylethynyl)pentacene/Au (111) Interface: Coupling, Molecular Orientation and Thermal Stability (literal)
Abstract
  • The assembly and the orientation of functionalized pentacene at the interface with inorganics strongly influence both the electric contact and the charge transport in organic electronic devices. In bis(triisopropylsilylethnyl)pentacene (TIPS-Pc) the TIPS functional groups not only improve the solubility in common organic solvents, but also features good transport properties arising from the \"brick-wall\" face-to-face arrangement of the molecular planes, that increases the intermolecular interactions with respect to the edge-to-face \"herringbone\" stacking of pentacene. In order to understand and control the assembling of TIPS-Pc on the Au(111) surface, we have combined electronic spectroscopies and theoretical modeling to investigate the properties TIPS-Pc/Au(111) interface as a function of the molecular coverage, to compare the molecular state in the gas- and in the adsorbed-phase and to determine the thermal stability of TIPS-Pc in contact with gold. Our results show that in the free molecule only the acene atoms directly bonded to the ligands are affected by the functionalization. Adsorption on Au(111) leads to a weak coupling which causes only modest binding energy shifts in the TIPS-Pc and substrate core level spectra. In the first monolayer the acene plane form an angle of 33º ± 2º with the Au(111) surface at variance with the vertical geometry reported for thicker solution-processed or evaporated films, whereas the presence of configurational disorder was observed in the multilayer. The thermal annealing of the TIPS-Pc/Au(111) interface reveals the ligand desorption at ~ 470 K, which leaves the backbone of the decomposed molecule flat-lying on the metal surface as in the case of the unmodified pentacene. The weak interaction with the metal substrate causes the molecular dissociation to occur 60 K above the thermal decomposition taking place in thick drop-cast films. (literal)
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