Modification of the organic/La 0.7 Sr 0.3 MnO 3 interface by in situ gas treatment

X. Z. Wang, X. M. Ding*, Z. S. Li, Y. Q. Zhan, I. Bergenti, V. A. Dediu, C. Taliani, Z. T. Xie, B. F. Ding, X. Y. Hou, W. H. Zhang, F. Q. Xu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

La 0.7 Sr 0.3 MnO 3 (LSMO) can act as a spin injection electrode in organic spin-valves and organic light-emitting devices. For the latter application, good control of the electronic structure of the organic/LSMO interface is a key issue to ensure sufficient current injection in the device. By exposing cleaned LSMO surfaces to activated oxygen and hydrogen, the work function of the samples can reach 5.15 and 4.3 eV, respectively, as shown by in situ photoemission measurements. The initial stage of formation of the organic/LSMO interface upon deposition of N,N′-bis-(1-naphyl)-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB) onto the oxygen-treated LSMO surface is examined. We find that the NPB molecules evenly cover the LSMO surface and that the interface barrier height is 0.8 eV, which is comparable to that at the NPB/indium tin oxide (ITO) interface with the ITO surface pretreated in situ by oxygen plasma.

Original languageEnglish
Pages (from-to)9081-9084
Number of pages4
JournalApplied Surface Science
Volume253
Issue number23
DOIs
StatePublished - 30 Sep 2007
Externally publishedYes

Keywords

  • Organic/magnetic interface
  • Spin injection
  • Surface treatment
  • Synchrotron radiation

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