The electronic structure and energy level alignment of porphyrin/metal interfaces studied by ultraviolet photoelectron spectroscopy

H. Ishii, S. Narioka, D. Yoshimura, M. Sei, Y. Ouchi, S. Hasegawa, T. Miyazaki, Y. Harima, K. Yamashita, K. Seki

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Electronic structures of 5,10,15,20-zinctetraphenylporphyrin (ZnTPP)/metal (Au, Ag, Al, Mg) interfaces prepared in ultrahigh vacuum condition were investigated by ultraviolet photoelectron spectroscopy (UPS). We found that the electronic energy levels of ZnTPP align with the vacuum level of substrate metal with a constant energy shift of the vacuum levels across the interface. These findings cannot be explained by the concepts of Fermi level alignment nor vacuum level alignment. We also found that sample exposure to oxygen induces energy level shift in close relation with change of substrate work function at oxygen exposure. The relation between the observed electronic structure and the electric characteristics of porphyrin/metal interfaces in solar cell is also discussed.

Original languageEnglish
Pages (from-to)559-564
Number of pages6
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume76
Issue numberC
DOIs
Publication statusPublished - Dec 29 1995
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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