Native surface oxide turns alloyed silicon membranes into nanophononic metamaterials with ultra-low thermal conductivity

Abstract

A detailed understanding of the relation between microscopic structure and phonon propagation at the nan oscale is essential to design materials with desired phononic and thermal properties.Here we uncover a new mechanism of phonon interaction in surface oxidized membranes, i.e., native oxide layers interact with phonons in ultra-thin silicon membranes through local resonances. The local resonances reduce the low frequency phonon group velocities and shorten their mean free path. This effect opens up a new strategy for ultralow thermal conductivity design as it complements the scattering mechanism which scatters higher frequency modes effectively. The combination of native oxide layer and alloying with germanium in concentration as small as 5% reduces the thermal conductivity of silicon membranes to 100 time lower than the bulk. In addition, the resonance mechanism produced by native oxide surface layers is particularly effective for thermal condutivity reduction even at very low temperatures, at which only low frequency modes are populated.

arXiv comment6 pages, 5 figures, Accepted for publication in Physical Review B

References in corpus (13)

• Phononics: Manipulating heat flow with electronic analogs and beyond
• Energy Dissipation and Transport in Nanoscale Devices
• Thermal diode: Rectification of heat flux
• Molecular dynamics calculation of the thermal conductivity of vitreous silica
• Direct Measurement of Room Temperature Non-diffusive Thermal Transport Over Micron Distances in a Silicon Membrane
• Impact of Phonon Surface Roughness Scattering on Thermal Conductivity of Thin Si Nanowires
• Role of anharmonic phonon scattering in the spectrally decomposed thermal conductance at planar interfaces
• Nanophononic metamaterial: Thermal conductivity reduction by local resonance
• Frequency-dependent phonon mean free path in carbon nanotubes from non-equilibrium molecular dynamics
• Impacts of Atomistic Coating on Thermal Conductivity of Germanium Nanowires
• Phonon Coherent Resonance and Its Effect on Thermal Transport In Core-Shell Nanowires
• Boundary scattering of phonons: specularity of a randomly rough surface in the small perturbation limit
• Ultra-Thin Free-Standing Single Crystalline Silicon Membranes With Strain Control

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• Phonon Confinement and Transport in Ultrathin Films
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• Anisotropic In-Plane Phonon Transport in Ultrathin Silicon Membranes Guided by Nano-Surface-Resonators
• Heat and charge transport in bulk semiconductors with interstitial defects
• Probing the Phonon Mean Free Paths in Dislocation Core by Molecular Dynamics Simulation
• Surface phonons limit heat conduction in thin films
• Advances in the optimization of silicon-based thermoelectrics: a theory perspective
• Phonon Scattering in the Complex Strain Field of a Dislocation