Reduction of thermal conductivity by surface scattering of phonons in periodic silicon nanostructures

Anufriev, Roman; Maire, Jérémie; Nomura, Masahiro

doi:10.1103/physrevb.93.045411

Cited by 81 publications

(95 citation statements)

References 39 publications

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“…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. This relative comparison shows that pillars could achieve the same reduction in the thermal conductivity without sacrificing the material volume or introducing scattering points inside the bulk of the material.…”

Section: Experimental Measurements Of the Thermal Propertiesmentioning

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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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%

Phonon and heat transport control using pillar-based phononic crystals

Anufriev

Nomura

2018

Science and Technology of Advanced Materials

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“…In that case the phonon band structure of the solid material is strongly modified and can even form frequency bands where propagating phonons do not exist. 15,16 The influence of coherent scattering on reducing thermal conductance was recently demonstrated in micron scale 2D PnC hole structures at ultra-low temperatures below 1K, 16 and calculations also exist for smaller periodicities, [17][18][19] where an enhancement is also predicted. 18,19 Numerical work also exists on the coherence effects in 1D beam geometry.…”

Section: Introductionmentioning

confidence: 99%

“…For PnC's there is the question, whether the periodicity is still just an incoherent array of scatterers, or whether wave coherence can play a role and modify the phonon dispersion relations. 6 Most of the experimental studies so far have concentrated on thermal conductivity at intermediate-to-room temperatures, and studied either on 2D holey structures [7][8][9][10] or 1D superlattices. 11,12 At those temperatures, diffusive scattering is definitely still operational, 13,14 meaning that the effect of coherence is only partial, if existing at all.…”

Section: Introductionmentioning

confidence: 99%

Low temperature heat capacity of phononic crystal membranes

Puurtinen

Maasilta

2016

AIP Advances

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Phononic crystal (PnC) membranes are a promising solution to improve sensitivity of bolometric sensor devices operating at low temperatures. Previous work has concentrated only on tuning thermal conductance, but significant changes to the heat capacity are also expected due to the modification of the phonon modes. Here, we calculate the area-specific heat capacity for thin (37.5 - 300 nm) silicon and silicon nitride PnC membranes with cylindrical hole patterns of varying period, in the temperature range 1 - 350 mK. We compare the results to two- and three-dimensional Debye models, as the 3D Debye model is known to give an accurate estimate for the low-temperature heat capacity of a bulk sample. We found that thin PnC membranes do not obey the 3D Debye T3 law, nor the 2D T2 law, but have a weaker, approximately linear temperature dependence in the low temperature limit. We also found that depending on the design, the PnC patterning can either enhance or reduce the heat capacity compared to an unpatterned membrane of the same thickness. At temperatures below ∼ 100 mK, reducing the membrane thickness unintuitively increases the heat capacity for all samples studied. These observations can have significance when designing calorimetric detectors, as heat capacity is a critical parameter for the speed and sensitivity of a device.

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“…Figure 4(b) shows results for the calculated phononic band diagram and heat ux spectrum in square lattice PnC nanostructures with a period of a = 300 nm, and a hole radius of r = 135 nm. The details of the simulation can be found in another work 25) . The band diagram for our arti cial periodic structure differs much from that of bulk silicon.…”

Section: Control Of Thermal Conductivity By Multiscale Archi-mentioning

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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Reduction of thermal conductivity by surface scattering of phonons in periodic silicon nanostructures

Cited by 81 publications

References 39 publications

Phonon and heat transport control using pillar-based phononic crystals

Phonon and heat transport control using pillar-based phononic crystals

Low temperature heat capacity of phononic crystal membranes

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

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