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A microdot multilayer oxide device: let us tune the strain-ionic transport interaction.

Sebastian Schweiger1, Markus Kubicek, Felix Messerschmitt

  • 1Electrochemical Materials, Department of Materials, ETH Zurich , 8093 Zurich, Switzerland.

ACS Nano
|April 12, 2014
PubMed
Summary

Strain engineering in multilayer microdots tunes ionic transport and resistive response. Sideways contacting is crucial for observing these strain-ionic transport effects in oxide devices.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Interfacial strain in multilayer heterostructures can influence material properties.
  • Oxide-based multilayer devices are promising for microelectrochemical applications.

Purpose of the Study:

  • To investigate the use of interfacial strain in oxide multilayer microdots to tune resistive response and ionic transport.
  • To demonstrate the importance of sideways electrode contacting for capturing strain-ionic transport effects.

Main Methods:

  • Fabrication of strained multilayer microdot devices using Gd0.1Ce0.9O(2-δ)/Er2O3.
  • Systematic variation of the number of layers to alter the proportion of strained volume.
  • Electrical measurements and Raman spectroscopy to analyze strain effects and ionic transport.

Main Results:

  • Altered activation energy by Δ0.31 eV through >1.16% compressive strain in ceria-based phases.
  • Demonstrated that sideways contacting is essential, while top-electrode contacting yields no observable strain effect.
  • Strain states were characterized relative to strain-activated volumes in the microdot multilayer.

Conclusions:

  • Strain engineering in microfabricated devices offers a powerful method to modulate ionic conduction beyond traditional doping.
  • The developed fabrication route and concept of strained multilayer microdots are suitable for various microelectrochemical devices.
  • This work highlights the necessity of nanoscopic scale sideways electrical contacting for strain-ionic transport studies.