Electronic structure of CdSe nanoparticles adsorbed on au electrodes by an organic linker: Fermi level pinning of the HOMO

T. Z. Markus, M. Wu, L. Wang, D. H. Waldeck, D. Oron, R. Naaman

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Assemblies of CdSe nanoparticles (NPs) on a dithiol-coated Au electrode were created, and their electronic energetics were quantified. This report describes the energy level alignment of the filled and unfilled electronic states of CdSe nanoparticles with respect to the Au Fermi level. Using cyclic voltammetry, it was possible to measure the energy of the filled states of the CdSe NPs with respect to the Au substrate relative to a Ag/AgNO3 electrode, and by using photoemission spectroscopy, it was possible to independently measure both the filled state energies (via single photon photoemission) and those of the unfilled states (via two photon photoemission) with respect to the vacuum level. Comparison of these two different measures shows good agreement with the IUPAC-accepted value of the absolute electrode potential. In contrast to the common model of energy level alignment, the experimental findings show that the CdSe filled states become 'pinned' to the Fermi level of the Au electrode, even for moderately small NP sizes.

Original languageEnglish
Pages (from-to)14200-14206
Number of pages7
JournalJournal of Physical Chemistry C
Volume113
Issue number32
DOIs
Publication statusPublished - Aug 13 2009

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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