Electronic structure and dynamics of quasi-2D states of vanadyl naphthalocyanine on Au(111)

Nahid Ilyas, Leah L. Kelly, Oliver L.A. Monti

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

We investigate the evolution of the interfacial electronic structure and dynamics of thin films of the organic semiconductor vanadyl naphthalocyanine on Au(111). Using angle-resolved two-photon photoemission, a comprehensive coverage- and excitation-energy-dependent characterisation of the electronic structure and the resulting dynamics of short-lived image potential resonances (IPRs) on Au(111) are presented. The study of these quasi-two-dimensional (quasi-2D) bands is enabled by molecular adsorption and reveals a significant lengthening of their lifetimes. The resonances remain, however, significantly coupled to the continuum of bulk bands of Au(111) even in the presence of the organic adsorbate, giving rise to Fano-like quantum interference and 'intensity switching' effects. Coupling to the continuum is also responsible for providing excitation pathways to the image potential manifold above and below optical resonance with the Shockley surface state. The organic semiconductor interface and quasi-2D bands investigated here provide a model for understanding the role of quantum effects in ultrafast dynamics of confined systems and at interfaces such as those that are relevant e.g. for interfacial charge-transfer processes in organic electronics.

Original languageEnglish (US)
Pages (from-to)2175-2188
Number of pages14
JournalMolecular Physics
Volume111
Issue number14-15
DOIs
StatePublished - May 20 2013

Keywords

  • Fano resonance
  • Image potential state
  • Organic semiconductor
  • Surface state
  • Two-photon photoemission spectroscopy

ASJC Scopus subject areas

  • Biophysics
  • Molecular Biology
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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