Energy level alignment at interfaces of organic semiconductor heterostructures

I. G. Hill, A. Kahn

Research output: Contribution to journalArticlepeer-review

149 Scopus citations


We have used ultraviolet photoelectron spectroscopy (UPS) to investigate the interfaces of two organic semiconductor heterostructures. UPS was used to determine the relative energies of the highest occupied molecular orbitals of the organic semiconductors, and to measure the interface dipoles at each interface. The two systems studied were the 4-4′-N,N′-dicarbazolyl-biphenyl(CBP)/tris(8-hydroxy-quinoline) aluminum (Alq3) interface, and the copper phthalocyanine (CuPc)/N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′biphenyl-4, 4″diamine (alpha;-NPD) interface. The assumption of a common vacuum level was found to be valid, within experimental uncertainty, for both interfaces.

Original languageEnglish (US)
Pages (from-to)5583-5586
Number of pages4
JournalJournal of Applied Physics
Issue number10
StatePublished - Nov 15 1998

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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