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Metal-to-Acceptor Charge Transfer through a Molecular Spacer Layer

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Humboldt-Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin, Germany
Helmholtz-Zentrum Berlin-BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany
§ Max Planck Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
Cite this: J. Phys. Chem. C 2011, 115, 35, 17503–17507
Publication Date (Web):July 28, 2011
Copyright © 2011 American Chemical Society

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    Abstract Image

    We investigate how the thermodynamic equilibrium is reached when a strong electron acceptor molecule (hexaaza-triphenylene-hexacarbonitrile, HATCN) is deposited on Ag(111) precovered with a physisorbed tris(8-hydroxyquinolinato)aluminum (Alq3) monolayer. Photoemission measurements reveal that equilibrium is achieved via a charge transfer from the metal to the HATCN layer through the Alq3 monolayer. The work function increase observed upon HATCN adsorption is explained by the formation of an interface dipole resulting from the metal-to-acceptor charge transfer and an electric field induced reorientation of the Alq3 molecule dipoles within the interlayer.

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    This article is cited by 22 publications.

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