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Writing and Low-Temperature Characterization of Oxide Nanostructures
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Compositional analysis of oxide-embedded III-V nanostructures.

Martin Ek1,2, C Leon M Petersson3, Jesper Wallentin2,4

  • 1Centre for Analysis and Synthesis, Lund University, Box 124, SE-22100, Lund, Sweden.

Nanotechnology
|June 6, 2022
PubMed
Summary
This summary is machine-generated.

Characterizing embedded nanowires is challenging. This study compares two electron microscopy techniques for analyzing InP-AlInP in aluminum oxide, finding they agree well but diverge under strain.

Keywords:
EELSIII–V materialsstraintransmission electron microscopy

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Physics

Background:

  • Embedded heterostructures, with one material encased in another, are formed via nanowire growth.
  • Materials-selective oxidation allows combining amorphous oxides with crystalline materials like III-V semiconductors.
  • Characterizing these structures with transmission electron microscopy (TEM) is difficult due to overlapping materials in projection and electron beam sensitivity.

Purpose of the Study:

  • To evaluate two techniques for analyzing embedded materials: local lattice parameter measurements and bulk plasmon energy measurements.
  • To assess the performance of these techniques on InP-AlInP segments embedded in amorphous aluminum oxide.
  • To investigate the complementarity and limitations of these methods, especially under strain.

Main Methods:

  • High-resolution micrographs for local lattice parameter measurements.
  • Electron energy loss spectroscopy (EELS) for bulk plasmon energy measurements.
  • Molecular dynamics simulations to analyze residual strain.

Main Results:

  • Both lattice parameter and plasmon energy measurements successfully analyzed the embedded InP-AlInP segments.
  • The two techniques demonstrated excellent agreement in strain-free regions.
  • Divergence in results was observed in strained regions, with each technique deviating in opposite directions from the true value.

Conclusions:

  • Local lattice parameter and bulk plasmon energy measurements are complementary techniques for characterizing oxide-embedded nanowire heterostructures.
  • These methods are effective even at reduced electron doses, addressing a key challenge in TEM analysis.
  • Understanding the influence of residual strain is crucial, as it can cause these techniques to yield differing results.