Thermal conductivity reduction in silicon fishbone nanowires

Maire, Jérémie; Anufriev, Roman; Hori, Takuma; Shiomi, Junichiro; Volz, Sébastian; Nomura, Masahiro

doi:10.1038/s41598-018-22509-0

Cited by 66 publications

(53 citation statements)

References 44 publications

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“…It means that κ = aN /(b + µN ), with a and b parameters independent of N and µ and depending on the other properties of the system, as discussed below. We underline that this behavior is in good qualitative agreement with most of experimental results concerning the size-dependent behavior of the thermal conductivity in nanosystems [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. It is also important to stress that, as anticipated, the conductivity is independent of the parameter α, proving that any particular choice of stochastic calculus is irrelevant to the physics of the system.…”

Section: Heat Conduction In the Mass-spring Chainsupporting

confidence: 85%

A stochastic force model for the ballistic-diffusive transition of heat conduction

Palla¹,

Patera²,

Cleri³

et al. 2020

Phys. Scr.

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We theoretically study the heat conduction in a harmonic chain with a stochastic force field, in contact with two Langevin thermal baths at different temperatures. In particular, we investigate the interplay between the thermal baths properties and the size of the system. To this aim, we introduce a stochastic force field, which is simple enough to be energy-conserving for each particle of the chain, but sufficiently aleatory to induce the ballistic to diffusive transition in the conductive behavior of the chain. When this stochastic force field is absent, we observe a ballistic behavior strongly dependent on the characteristic collision frequency of the thermal baths for any size of the system. On the other hand, when the stochastic force field is activated, the diffusive behavior is established and the effect of the thermal baths is removed in the thermodynamic limit.

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Section: Heat Conduction In the Mass-spring Chainsupporting

confidence: 85%

A stochastic force model for the ballistic-diffusive transition of heat conduction

Palla¹,

Patera²,

Cleri³

et al. 2020

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…For instance, at room temperatures, the thermal conductivity of modulated nanowires was reduced from κ∼45 to κ∼28 W m −1 K −1 upon reducing the neck size from 122 to 45 nm. It was also observed that by increasing the difference between the smaller and larger cross-sectional dimension, a small reduction in thermal conductivities was obtained which was not predicted by phonon transport simulations [101]. At very small length scales, molecular dynamics simulations have suggested that by engineering modulations in nanowires of diameter d∼5 nm, strong reduction in thermal conductivity can be obtained due to the changes in the phonon dispersion relations caused by acoustic softening [103], which reduces the phonon velocities in nanostructures.…”

Section: Surface Modulated Nanowiresmentioning

confidence: 95%

“…In such step modulated nanowires, recent experimental measurements found that thermal conductivity is strongly determined by the size of the smaller nanowire section (i.e. neck) ( figure 7(a)) [101]. For instance, at room temperatures, the thermal conductivity of modulated nanowires was reduced from κ∼45 to κ∼28 W m −1 K −1 upon reducing the neck size from 122 to 45 nm.…”

Section: Surface Modulated Nanowiresmentioning

confidence: 98%

Phononic pathways towards rational design of nanowire heat conduction

Malhotra

Maldovan

2019

Nanotechnology

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Thermal conduction in semiconductor nanowires is controlled by the transport of atomic vibrations also known as thermal phonons. The ability of nanowires to tailor the transport of thermal phonons stems from their precise atomic scale growth coupled with high structural surface to volume ratios. Understanding and manipulating thermal transport properties at the nanoscale is central for progress in the fields of microelectronics, optoelectronics, and thermoelectrics. Here, we review state-of-the-art advances in the understanding of nanowire thermal phonon transport and the design and fabrication of nanowires with tailored thermal conduction properties. We first introduce the basic physical mechanisms of thermal conduction at the nanoscale and detail recent developments in employing nanowires as thermal materials. We discuss and provide insight on different strategies to modulate nanowire thermal properties leveraging the underlying phonon transport processes occurring in nanowires. We also highlight challenges and key areas of interest to motivate future research and create exceptional capabilities to control heat flow in nanowires.

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“…Measurements are represented by discrete data points, and results obtained by simulations are plotted by solid lines with dots. Adapted with permission . Copyright 2018, Springer Nature; the notation used is applicable only to this figure.…”

Section: Thermal Transport In Nanostructured Membranesmentioning

confidence: 99%

Section: Npm Versus Npcmentioning

confidence: 99%

Thermal Conductivity Reduction in a Nanophononic Metamaterial versus a Nanophononic Crystal: A Review and Comparative Analysis

Hussein

Tsai

Honarvar

2019

Adv Funct Materials

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The notion of a locally resonant metamaterial—widely applied to light and sound—has recently been introduced to heat, whereby the thermal conductivity is reduced primarily by intrinsic localized atomic vibrations rather than scattering mechanisms. This article reviews and analyzes this new emerging concept, termed nanophononic metamaterial (NPM), and contrasts it with the competing concept of a nanophononic crystal (NPC) in which thermal conductivity reduction is realized primarily via nanoscale Bragg scattering. Both the NPM and NPC core mechanisms require the presence of a sufficient level of wave behavior, which is possible when there is a relatively wide distribution of the phonon mean free path (MFP). Silicon serves as a perfect material to form NPMs and NPCs given its relatively large average phonon MFP. This offers a unique opportunity considering silicon's abundance and mature fabrication technology. It is shown in this comparative study that while both the NPM and NPC nanosystems may be rendered to serve as extreme insulators of heat, an NPM may do so without excessive reduction in the minimum feature size–which is key to keeping the electrical properties intact. This trait makes a silicon‐based NPM poised to serve as a low‐cost thermoelectric material with exceptional performance.

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Thermal conductivity reduction in silicon fishbone nanowires

Cited by 66 publications

References 44 publications

A stochastic force model for the ballistic-diffusive transition of heat conduction

A stochastic force model for the ballistic-diffusive transition of heat conduction

Phononic pathways towards rational design of nanowire heat conduction

Thermal Conductivity Reduction in a Nanophononic Metamaterial versus a Nanophononic Crystal: A Review and Comparative Analysis

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