Energy level alignment of a zinc(II) tetraphenylporphyrin dye adsorbed onto TiO2(110) and ZnO(112̄0) surfaces

Sylvie Rangan, Senia Katalinic, Ryan Thorpe, Robert Allen Bartynski, Jonathan Rochford, Elena Galoppini

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

The electronic structure of the Zn(II)-5-(3,5-dicarboxyphenyl)-10,15,20- triphenylporphyrin dye (ZnTPP-Ipa), chemisorbed onto ZnO(112̄0) and TiO2(110) single-crystal surfaces, has been investigated by means of density functional theory (DFT) and by electron spectroscopy methods in an ultra-high-vacuum environment. The core levels (Ti 2p and Zn 2p) as well as the valence band have been probed using X-ray and ultraviolet photoemission spectroscopies, whereas the conduction band has been evaluated from inverse photoemission spectroscopy. The calculated density of states for the gas phase molecule compares well to the experimentally determined electronic structure, allowing both a simple understanding of the adsorbate electronic properties and a direct determination of the ZnTPP-Ipa frontier orbitals with respect to the substrates' band edges.

Original languageEnglish (US)
Pages (from-to)1139-1147
Number of pages9
JournalJournal of Physical Chemistry C
Volume114
Issue number2
DOIs
StatePublished - Jan 21 2010

All Science Journal Classification (ASJC) codes

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

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