Energy level alignment of catechol molecular orbitals on ZnO(1 1over(2, ̄) 0) and TiO 2 (1 1 0) surfaces

Sylvie Rangan, Jean Patrick Theisen, Eric Bersch, Robert Bartynski

Research output: Contribution to journalArticle

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Abstract

The occupied and unoccupied electronic structure of catechol adsorbed onto two single crystal surfaces, rutile TiO 2 (1 1 0) and wurtzite ZnO(1 1over(2, ̄) 0), have been investigated using UV-photoemission and inverse photoemission spectroscopies (UPS and IPS) in an ultra-high vacuum environment. To aid in assignment of the spectral features, model metal-bound catechol structures were calculated using a DFT approach. From these measurements, the energy alignment of the catechol-related states with respect to the substrates band edges is directly determined and is in good agreement with a direct injection process of the photoexcited electron into the substrate conduction band, resulting in the characteristic absorption properties of adsorbed catechol.

Original languageEnglish (US)
Pages (from-to)4829-4833
Number of pages5
JournalApplied Surface Science
Volume256
Issue number15
DOIs
Publication statusPublished - May 15 2010

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Keywords

  • Direct injection
  • Energy alignment
  • Inverse photoemission
  • Photoemission
  • Photoexcitation

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