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Publication Detail
Interfacial dipole dynamics of light-emitting diodes incorporating a poly(amidoamine) dendrimer monolayer
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Winroth G, Fenwick O, Scott MA, Yip D, Howorka S, Cacialli F
  • Publisher:
    AMER INST PHYSICS
  • Publication date:
    26/07/2010
  • Journal:
    APPL PHYS LETT
  • Volume:
    97
  • Issue:
    4
  • Article number:
    043304
  • Print ISSN:
    0003-6951
  • Language:
    EN
  • Keywords:
    light emitting diodes, monolayers, polymers, self-assembly, work function, INDIUM-TIN OXIDE, ELECTRON TRANSPORTING LAYERS, CONJUGATED POLYMERS, SIDE-GROUPS, ION MOTION, FILMS, ELECTROLUMINESCENCE, INJECTION, DEVICES, ANODES
  • Addresses:
    Winroth, G
    UCL
    Dept Phys & Astron
    London
    WC1E 6BT
    England

    UCL
    London Ctr Nanotechnol
    London
    WC1E 6BT
    England
Abstract
We investigate the effects induced by a nonconjugated self-assembled monolayer of poly(amidoamine) (PAMAM) on the work function of thermally evaporated Al-electrodes. We compare results from Kelvin probe measurement of the electrodes work function with electroabsorption characterization of the built-in voltage of polymer light-emitting diodes incorporating them. Interestingly, we find that the PAMAM monolayer decreases the work function by 0.4 eV in a Kelvin probe measurement but that the dipole induced by the PAMAM monolayer is altered by biasing, and that it exhibits a hysteretic behavior in a cyclic voltage scan. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3459964]
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