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Controlling Thermal Conductivity of Amorphous SiO Films through Structural Engineering Utilizing Single Crystal

Katelyn A Kirchner1,2, Sohei Ogasawara1,3, Melbert Jeem4

  • 1Research Institute for Electronic Science, Hokkaido University, N20W10, Sapporo 001-0020, Japan.

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Summary
This summary is machine-generated.

Researchers developed thin silica glass (SiO2) films with significantly reduced thermal conductivity (κ) by controlling atomic ordering with substrate surfaces. This breakthrough enables advanced insulating materials for electronics packaging and power electronics applications.

Keywords:
amorphous SiOxgrazing incidence X-ray total scatteringintermediate ordering structuresingle crystal substratethermal conductivitythin film

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Developing insulating thin films with low thermal conductivity (κ) and high dielectric breakdown strength is crucial for advanced electronics packaging and power electronics.
  • Silica glass (SiO2) offers high dielectric strength but typically has higher κ than multicomponent glasses.
  • Optimizing κ in SiO2 films is key to enhancing thermal management in electronic devices.

Purpose of the Study:

  • To investigate methods for reducing thermal conductivity (κ) in silica glass (SiO2) thin films.
  • To understand the relationship between atomic ordering, substrate interactions, and thermal transport in SiO2 films.
  • To enable the design of novel insulating materials for demanding electronic applications.

Main Methods:

  • Fabrication of SiO2 thin films with controlled atomic ordering.
  • Utilizing substrate surface atom constraints to influence film structure.
  • Characterization of atomic ordering using grazing incidence X-ray total scattering.
  • Measurement of thermal conductivity (κ) in the fabricated films.

Main Results:

  • A significant, systematic decrease in thermal conductivity (κ) was achieved by shortening intermediate ordering distances.
  • Stronger constraints from substrate surface atoms led to reduced κ.
  • SiO2 films on Si substrates exhibited the most substantial κ reduction, reaching one-third of the bulk value.
  • Changes in atomic ordering were confirmed by shifts in the main halo observed via X-ray scattering.

Conclusions:

  • Substrate-induced control over atomic ordering is an effective strategy for minimizing thermal conductivity (κ) in SiO2 thin films.
  • This provides a pathway for designing advanced insulating materials with tailored thermal properties for electronics.
  • The findings contribute to a deeper understanding of thermal transport mechanisms in amorphous thin films.