Interface dipole engineering at buried organic-organic semiconductor heterojunctions

Andrew L. Shu, William E. McClain, Jeffrey Schwartz, Antoine Kahn

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


A general technique for modifying energy level alignment at organic-organic heterojunctions is introduced, and is demonstrated here for phenyl-C 61-butyric acid methyl ester (PCBM) and N,N′-Di-[(1-naphthyl)- N,N′-diphenyl]-1,1′-biphenyl)-4,4′-diamine (α-NPD). An ultra-thin layer (∼1 nm) of TiO2 is used as an adhesion template to attach a self-assembled monolayer of dipolar phosphonate (PA) molecules to the lower interface of a two-stack ensemble. This modification induces shifts in the vacuum level and work function over ∼1.0 eV depending on the molecular dipole moment of the PA, which in turn modifies the electronic level alignment across the organic heterojunction interface by up to 0.5 eV.

Original languageEnglish (US)
Pages (from-to)2360-2366
Number of pages7
JournalOrganic Electronics
Issue number10
StatePublished - Oct 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • General Chemistry
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering


  • Interface modification
  • Organic-organic interface
  • PCBM
  • Self-assembled monolayer
  • α-NPD


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