Anodic oxidation of ultra-thin Ti layers on ITO substrates and their application in organic electronic memory elements

P.S. Heljo (Corresponding Author), K. Wolff, K. Lahtonen, M. Valden, P.R. Berger, Himadri Majumdar, D. Lupo

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Abstract

In this work, controlled anodic oxidation is reported for ultra-thin (3 nm thick) titanium layers on indium tin oxide (ITO) coated glass substrates. A physical explanation is also provided for the origin of the delamination process of the Ti during the anodic oxidation. The properties of the fabricated layers are studied using electrochemical impedance spectroscopy (EIS) and X-ray Photoelectron Spectroscopy (XPS). In addition, one intriguing application is demonstrated for the anodized layers: their use as an interfacial barrier in organic diodes. Diodes containing an electrochemically fabricated TiO 2 barrier layer exhibit clear room temperature negative differential resistance (NDR) and a peak-to-valley current ratio (PVCR) of 3.6. The reference diodes without the TiO2 layer show normal diode characteristics with no observable NDR. The NDR diodes have potential applications as memory elements for large-area electronics.
Original languageEnglish
Pages (from-to)91-98
JournalElectrochimica Acta
Volume137
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

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Keywords

  • anodic oxidation
  • ultra-thin oxides
  • defect density analysis
  • negative differential resistance

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