Atomic scale control of single molecule charging

  • G. Mikaelian
    University of California Department of Physics and Astronomy and Department of Chemistry, , Irvine, California 92697-4575
  • N. Ogawa
    University of California Department of Physics and Astronomy and Department of Chemistry, , Irvine, California 92697-4575
  • X. W. Tu
    University of California Department of Physics and Astronomy and Department of Chemistry, , Irvine, California 92697-4575
  • W. Ho
    University of California Department of Physics and Astronomy and Department of Chemistry, , Irvine, California 92697-4575

説明

<jats:p>A scanning tunneling microscope was used to study charging of single copper phthalocyanine molecules adsorbed on an ultrathin Al2O3 film grown on a NiAl(110) surface. A double-barrier tunnel junction is formed by a vacuum barrier between the tip and the molecule and an oxide barrier between the molecule and the NiAl. In this geometry the molecule can be charged by the tunneling electrons. This charging was found to be strongly dependent on the position of the tip above the molecule and the applied bias voltage.</jats:p>

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