Impeded thermal transport in Si multiscale hierarchical architectures with phononic crystal nanostructures

Nomura, Masahiro; Kage, Yuta; Nakagawa, Junki; Hori, Takuma; Maire, Jérémie; Shiomi, Junichiro; Anufriev, Roman; Moser, Dominik; Oliver, Paul

doi:10.1103/physrevb.91.205422

Cited by 67 publications

(71 citation statements)

References 34 publications

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“…However, the experimentally observed 20% reduction in thermal conductivity is interesting to compare with the reduction obtained in other silicon-based nanostructures. On one hand, a stronger reduction was measured in silicon with pores (>50%) [9,18,19], nanodots (>70%) [13,68], polycrystalline grains (>80%) [15,69,70], dopants (>50%) [71,72] or germanium atoms (>70%) [14,71,73]. On the other hand, the 20% reduction by the pillars [63] is comparable to the reduction by holes (20–25%) [21,74] or slits (20–30%) [75] covering the same relative area.…”

Section: Experimental Measurements Of the Thermal Propertiesmentioning

confidence: 99%

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Phonon and heat transport control using pillar-based phononic crystals

Anufriev

Nomura

2018

Science and Technology of Advanced Materials

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Phononic crystals have been studied for the past decades as a tool to control the propagation of acoustic and mechanical waves. Recently, researchers proposed that nanosized phononic crystals can also control heat conduction and improve the thermoelectric efficiency of silicon by phonon dispersion engineering. In this review, we focus on recent theoretical and experimental advances in phonon and thermal transport engineering using pillar-based phononic crystals. First, we explain the principles of the phonon dispersion engineering and summarize early proof-of-concept experiments. Next, we review recent simulations of thermal transport in pillar-based phononic crystals and seek to uncover the origin of the observed reduction in the thermal conductivity. Finally, we discuss first experimental attempts to observe the predicted thermal conductivity reduction and suggest the directions for future research.

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Section: Experimental Measurements Of the Thermal Propertiesmentioning

confidence: 99%

“…Moreover, PnCs can reduce the thermal conductivity [5,6]. Thus, PnCs can enhance the thermoelectric efficiency of poor thermoelectric materials, such as silicon [7–9], and be used in energy harvesting applications [10,11] along with other nanostructured [11–14] and hierarchical [15,16] materials.…”

Section: Introductionmentioning

confidence: 99%

Phonon and heat transport control using pillar-based phononic crystals

Anufriev

Nomura

2018

Science and Technology of Advanced Materials

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“…Many research studies have reported characteristic transport properties and large thermal conductivity reductions by shortening the effective mean free path (MFP) of thermal phonons in a variety of nanostructured semiconductors [1][2][3][4][5][6][7][8] . Singlecrystalline Si provides an ideal phonon transport system due to its long thermal phonon MFP, which is longer than 100 nm 9,10 at room temperature, and which enables a systematic investigation of thermal conductivity control by welldefined nanopatterning, such as phononic crystal (PnC) nanostructures formed by electron beam (EB) lithography [11][12][13][14][15][16][17][18] . To date, thermal conduction in PnCs has been mainly investigated with square lattices, but there have been few experiments for other lattice types so far.…”

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confidence: 99%

Crystal structure dependent thermal conductivity in two-dimensional phononic crystal nanostructures

Nakagawa

Kage

Hori

et al. 2015

Applied Physics Letters

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Thermal phonon transport in square-and triangular-lattice Si phononic crystal (PnC) nanostructures with a period of 300 nm was investigated by measuring the thermal conductivity using micrometer-scale time-domain thermoreflectance. The placement of circular nanoholes has a strong influence on thermal conductivity when the periodicity is within the range of the thermal phonon mean free path. A staggered hole structure, i.e., a triangular lattice, has lower thermal conductivity, where the difference in thermal conductivity depends on the porosity of the structure. The largest difference in conductivity of approximately 20% was observed at a porosity of around 30%.This crystal structure dependent thermal conductivity can be understood by considering the local heat flux disorder created by a staggered hole structure. Numerical simulation using the Monte Carlo technique was also employed and also showed the lower thermal conductivity for a triangular lattice structure. Besides gaining a deeper understanding of nanoscale thermal phonon transport, this information would be useful in the design of highly efficient thermoelectric materials created by nanopatterning.

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“…Then, the experimental temporal evolution can be compared with simulation results 20) . Our custom-made micro-TDTR setup can measure in-plane thermal conductivity in micro/nano structures using focused pump and probe laser beams 21) . The metal layer converts the light to thermal energy, effectively acting as a transducer to detect temperature change by observing changes in re ectance.…”

Section: Micro-thermore Ectance Methodsmentioning

confidence: 99%

Control of Phonon Transport by Phononic Crystals and Application to Thermoelectric Materials

Nomura

2016

Mater. Trans.

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Phonon transport and thermodynamic properties of nanostructured materials have been investigated and utilized to improve thermoelectric performance for various materials. In nanostructures, phonon transport is completely different from that in bulk materials and results in dramatic enhancement in the thermoelectric performance. This article reviews the impact of nanostructuring on the phonon transport and mainly focuses on phononic crystal nanostructures, in which the wave nature of phonons also plays an important role. We demonstrate that it is important to ef ciently scatter thermal phonons, which distribute to wide range of frequencies, with different phonon scattering mechanisms in the spatial domain. We also demonstrate an enhancement of thermoelectric property of polysilicon thin lms by phononic crystal patterning.

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Impeded thermal transport in Si multiscale hierarchical architectures with phononic crystal nanostructures

Cited by 67 publications

References 34 publications

Phonon and heat transport control using pillar-based phononic crystals

Phonon and heat transport control using pillar-based phononic crystals

Crystal structure dependent thermal conductivity in two-dimensional phononic crystal nanostructures

Control of Phonon Transport by Phononic Crystals and Application to Thermoelectric Materials

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