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Updated: Apr 12, 2026

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Phonon Engineering in Isotopically Disordered Silicon Nanowires.

S Mukherjee1, U Givan2, S Senz2

  • 1†Department of Engineering Physics, Polytechnique Montréal, C. P. 6079, Succ. Centre-Ville, Montréal, Québec H3C 3A7, Canada.

Nano Letters
|May 21, 2015
PubMed
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Stable isotopes in silicon nanowires enable phonon engineering. Mass disorder significantly enhances phonon scattering and reduces thermal conductivity in isotopically mixed nanowires compared to pure ones.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Physics

Background:

  • Stable isotopes offer novel ways to engineer semiconductor nanowire properties.
  • Isotopically enriched silane precursors enable precise control over material composition.
  • Nanoscale and quantum phenomena can be highlighted using isotopic manipulation.

Purpose of the Study:

  • To investigate phonon engineering in silicon nanowires using tailor-made isotopic compositions.
  • To elucidate the effect of mass disorder on phonon behavior and thermal conductivity.
  • To compare phonon scattering and thermal properties of isotopically mixed and pure silicon nanowires.

Main Methods:

  • Growth of metal-catalyzed silicon nanowires using isotopically enriched silane precursors ((28)SiH4, (29)SiH4, (30)SiH4).
Keywords:
NanowiresRaman spectroscopyatom probe tomographyphononsstable isotopesthermal conductivity

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  • Investigation of isotopically mixed nanowires ((28)Si(x)(30)Si(1-x)) with high mass disorder (x ≈ 0.5).
  • Raman nanothermometry to measure thermal conductivity.

    • Main Results:

    • Isotopically mixed nanowires exhibit significantly enhanced phonon scattering compared to bulk crystals.
    • Nonuniform isotope distribution in mixed nanowires leads to pronounced mass disorder effects.
    • Thermal conductivity of mixed nanowires is approximately 30% lower than that of pure silicon nanowires.

    Conclusions:

    • Mass disorder in silicon nanowires strongly influences phonon behavior and reduces thermal conductivity.
    • Isotopic engineering provides a powerful tool for controlling thermal properties at the nanoscale.
    • Findings agree with theoretical predictions and open avenues for novel device applications.