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Nanoscale elemental quantification in heterostructured SiGe nanowires.

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  • 1Univ. Grenoble Alpes, F-38000 Grenoble, France.

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Scanning Auger Microscopy (SAM) characterized nanoscale Si1-xGex nanowires, revealing germanium (Ge) radial growth. Reliable chemical characterization is achieved for nanowires over 100 nm in diameter.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Axial heterostructured silicon-germanium (Si1-xGex) nanowires (NWs) are crucial for advanced electronic and optoelectronic devices.
  • Understanding their nanoscale chemical composition is essential for device performance and fabrication.
  • Scanning Auger Microscopy (SAM) offers high-resolution surface analysis capabilities.

Purpose of the Study:

  • To perform nanoscale chemical characterization of axial heterostructured Si1-xGex NWs.
  • To investigate axial and radial composition heterogeneities within the NWs.
  • To evaluate the applicability and limitations of SAM for quantifying NW composition.

Main Methods:

  • Utilized Scanning Auger Microscopy (SAM) for nanoscale chemical analysis.
  • Employed local spectroscopy, line-scan, and depth profile measurements.
  • Verified quantification by assessing preferential sputtering on bulk SiGe samples.

Main Results:

  • Achieved sufficient lateral resolution with SAM to resolve individual Si1-xGex NWs.
  • Confirmed radial growth of Germanium (Ge), forming a Ge shell around the NWs.
  • Established reliable quantification for NWs >100 nm, but identified limitations for smaller NWs due to edge effects and backscattered electron contributions.

Conclusions:

  • SAM is a powerful tool for the nanoscale chemical characterization of Si1-xGex NWs.
  • Ge radial growth is a significant phenomenon in these heterostructured NWs.
  • Quantification accuracy in SAM is size-dependent for NWs, requiring careful consideration of topographical effects for smaller structures.