Contact potential difference measurements of doped organic molecular thin films

Calvin Chan, Weiying Gao, Antoine Kahn

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


The ultraviolet photoemission spectroscopy (UPS) technique coupled with contact potential difference measurements was used to investigate the possibility of nonequilibrium conditions in doped organic molecular thin films. Zinc phthalocyanine (ZnPc) and N,Ń-diphenyl-N,ń-bis(1-naphthyl)-1, 1́biphenyl-4,4″ diamine (α-NPD) p-doped with the acceptor molecule were investigated as samples. An upward movement of the vacuum level away from the metal surface with respect to the Fermi level was observed. The results indicate towards the photovoltage being an unsignificant factor in these doped films, during UPS.

Original languageEnglish (US)
Pages (from-to)1488-1492
Number of pages5
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Issue number4
StatePublished - Jul 2004

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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