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Title: Tailoring the energy level alignment at the Co/Alq{sub 3} interface by controlled cobalt oxidation

We have studied the influence of oxygen exposure at the prototypical interface between cobalt and the organic semiconductor tris(8-hydroxyquinoline)aluminum (III) (Alq{sub 3}) by photoemission spectroscopy. We find that oxidation of the cobalt leads to a gradual suppression of hybrid interface states, to a progressive change in the work function and to a continuous energetic shift of the molecular orbitals towards higher binding energies. Based on these observations, we propose controlled oxidation of the ferromagnetic electrode as an easy and effective possibility to tune the performance of organic spintronics devices.
Authors:
; ; ; ; ;  [1]
  1. Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern (Germany)
Publication Date:
OSTI Identifier:
22217761
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 25; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALUMINIUM; BINDING ENERGY; COBALT; ELECTRODES; ENERGY LEVELS; FERROMAGNETIC MATERIALS; INTERFACES; ORGANIC SEMICONDUCTORS; OXIDATION; OXINE; PERFORMANCE; PHOTOELECTRON SPECTROSCOPY; PHOTOEMISSION; ULTRAVIOLET RADIATION; WORK FUNCTIONS