Chemistry and electronic properties of metal contacts on an organic molecular semiconductor

Y. Hirose, C. I. Wu, V. Aristov, P. Soukiassian, Antoine Kahn

Research output: Contribution to journalArticle

53 Scopus citations

Abstract

This paper gives a brief review of the electronic properties of the surface of an organic molecular semiconductor, i.e. PTCDA, and of the chemical and electrical properties of its contacts with to metals, i.e. Ti and Au. The combination of direct and inverse photoemission spectroscopies demonstrates that correlation effects are small in PTCDA. Synchrotron radiation photoemission spectroscopy shows that the Ti/PTCDA interface is reacted and that chemistry-induced electronic states in the PTCDA band gap lead to an Ohmic contact. The Au/PTCDA interface, on the other hand, is unreacted and abrupt and the Au/PTCDA contact is rectifying. This duality, which applies also to other metal/PTCDA interfaces, suggests the overwhelming importance of chemistry in defining electrical properties of contacts to organic molecular thin films.

Original languageEnglish (US)
Pages (from-to)291-298
Number of pages8
JournalApplied Surface Science
Volume113-114
DOIs
StatePublished - Apr 1997

All Science Journal Classification (ASJC) codes

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

Keywords

  • Contact
  • Organic semiconductor

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