Thermal transport in nanoporous holey silicon membranes investigated with optically-induced transient thermal gratings

Abstract

In this study, we use the transient thermal grating optical technique \textemdash a non-contact, laser-based thermal metrology technique with intrinsically high accuracy \textemdash to investigate room-temperature phonon-mediated thermal transport in two nanoporous holey silicon membranes with limiting dimensions of 100 nm and 250 nm respectively. We compare the experimental results to ab initio calculations of phonon-mediated thermal transport according to the phonon Boltzmann transport equation (BTE) using two different computational techniques. We find that the calculations conducted within the Casimir framework, i.e. based on the BTE with the bulk phonon dispersion and diffuse scattering from surfaces, are in quantitative agreement with the experimental data, and thus conclude that this framework is adequate for describing phonon-mediated thermal transport through holey silicon membranes with feature sizes on the order of 100 nm.

References in corpus (9)

• Temperature dependent effective third order interatomic force constants from first principles
• Efficient simulation of multidimensional phonon transport using energy-based variance-reduced Monte Carlo formulations
• Heat conduction tuning using the wave nature of phonons
• An alternative approach to efficient simulation of micro/nanoscale phonon transport
• Two-Dimensional Phononic Crystals: Disorder Matters
• Thermal Conductivity of Isotopically Enriched 28Si Revisited
• Phase-controlled, heterodyne laser-induced transient grating measurements of thermal transport properties in opaque material
• Thermal and Thermoelectric Transport in Nanostructures and Low-Dimensional Systems
• Coherent and Incoherent Thermal Transport in Nanomeshes

Cited by in corpus (4)

• Tutorial: Characterizing Microscale Energy Transport in Materials with Transient Grating Spectroscopy
• Optical and thermal characterization of a group-III nitride semiconductor membrane by microphotoluminescence spectroscopy and Raman thermometry
• Enhanced Thermoelectric Performance of Polycrystalline Si0.8Ge0.2 Alloys through the Addition of Nanoscale Porosity
• Ultrafast spin dynamics in the proximate quantum spin liquid α-RuCl3