The effect of interfacial layer thickness on the interface dipole energy in $O_2$ plasma treated metal/organic interface

  • Kim, Soo-Young (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Lee, Jong-Lam (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH))
  • Published : 2009.10.12

Abstract

Interface dipole energies between interfacial layers with different thicknesses coated on indium tin oxides (ITOs) and 4,4'-bis[N-(1-naphtyl)-N-phenyl-amino]biphenyl are determined. After $O_2$ plasma treatment on thick-metal (>4 nm) coated ITO, the work function and interface dipole energy increased. In thin-metal (< 2 nm) coated ITO, no change in the interface dipole energy was found though the work function increased. Thus, the $O_2$ plasma treated thin (< 2 nm) interfacial layer reduced the hole injection barrier.

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