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Publication Detail
Photoinduced work function changes by isomerization of a densely packed azobenzene-based SAM on Au: a joint experimental and theoretical study
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Crivillers N, Liscio A, Di Stasio F, Van Dyck C, Osella S, Cornil D, Mian S, Lazzerini GM, Fenwick O, Orgiu E, Reinders F, Braun S, Fahlman M, Mayor M, Cornil J, Palermo V, Cacialli F, Samori P
  • Publisher:
    ROYAL SOC CHEMISTRY
  • Publication date:
    2011
  • Pagination:
    14302, 14310
  • Journal:
    PHYS CHEM CHEM PHYS
  • Volume:
    13
  • Issue:
    32
  • Print ISSN:
    1463-9076
  • Language:
    EN
  • Keywords:
    SELF-ASSEMBLED MONOLAYERS, LIGHT-EMITTING-DIODES, FIELD-EFFECT TRANSISTORS, INDUCED MOLECULAR-MOVEMENTS, PROBE FORCE MICROSCOPY, KELVIN PROBE, CHARGE INJECTION, GROUND-STATE, SYSTEMS, SURFACE
  • Addresses:
    Mayor, M
    Univ Basel
    Dept Chem
    CH-4056
    Basel
    Switzerland

    UCL
    London Ctr Nanotechnol
    London
    WC1E 6BT
    England

    KIT
    Inst Nanotechnol
    D-76021
    Karlsruhe
    Germany
Abstract
Responsive monolayers are key building blocks for future applications in organic and molecular electronics in particular because they hold potential for tuning the physico-chemical properties of interfaces, including their energetics. Here we study a photochromic SAM based on a conjugated azobenzene derivative and its influence on the gold work function (Phi(Au)) when chemisorbed on its surface. In particular we show that the Phi(Au) can be modulated with external stimuli by controlling the azobenzene trans/cis isomerization process. This phenomenon is characterized experimentally by four different techniques, kelvin probe, kelvin probe force microscopy, electroabsorption spectroscopy and ultraviolet photoelectron spectroscopy. The use of different techniques implies exposing the SAM to different measurement conditions and different preparation methods, which, remarkably, do not alter the observed work function change (Phi(trans)-Phi(cis)). Theoretical calculations provided a complementary insight crucial to attain a deeper knowledge on the origin of the work function photo-modulation.
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