Band alignment at organic-inorganic semiconductor interfaces: α-NPD and CuPc on InP(110)

T. Chassé, C. I. Wu, I. G. Hill, A. Kahn

Research output: Contribution to journalArticle

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Abstract

Photoemission spectroscopy was used to investigate the heterojunctions between InP(110) and two organic semiconductors, N,N′-diphenyl-N,N′-bis(1-naphthyl)-1-1′biphenyl-4,4″diamine (α-NPD) and copper-phthalocyanine (CuPc). Both interfaces exhibit dipole barriers that demonstrate the breakdown of the vacuum level alignment rule, and suggest a displacement of negative charge form the organic to the inorganic semiconductor. The direction of the charge displacement is consistent with the relative electron affinities and ionization energies of the solids.

Original languageEnglish (US)
Pages (from-to)6589-6592
Number of pages4
JournalJournal of Applied Physics
Volume85
Issue number9
DOIs
StatePublished - May 1 1999

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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