Ordering of organic molecules on passivated reactive substrates: PTCDA on O-p(2 × 2)-Ni(1 1 1)

  • Tiba M
  • Kurnosikov O
  • Flipse C
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The ordering of an organic molecular layer on a ferromagnetic substrate is studied using scanning tunnelling microscopy. Highly ordered layers of perylene-tetracarboxylic-dianhydride (PTCDA) were prepared by vacuum sublimation on an oxygen precovered Ni(1 1 1) surface. The structure of thin layers of PTCDA deposited at room temperature was investigated as a function of growth rates and thickness. It is demonstrated that oxygen passivation reduces the reactivity sufficiently to lead to well-ordered overlayers of PTCDA. For thin films grown at low deposition rates, a herringbone-like structure has been observed. This structure is consistently observed in the islands with typically 100 nm in diameter and 1-2 ML thickness. Depositing thicker films at higher deposition rates results in polycrystalline islands. Within the polycrystalline islands two distinct stripe-like phases are observed in domains with a lateral size of typically 10 nm. The potential impact of these results for organo-metallic spintronic devices is addressed. © 2001 Elsevier Science B.V. All rights reserved.

Author-supplied keywords

  • Aromatics
  • Evaporation and sublimation
  • Molecular beam epitaxy
  • Nickel
  • Oxygen
  • Scanning tunneling microscopy
  • Surface structure, morphology, roughness, and topography

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  • M. V. Tiba

  • O. Kurnosikov

  • C. F.J. Flipse

  • B. Koopmans

  • H. J.M. Swagten

  • J. T. Kohlhepp

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