Nanophononics: state of the art and perspectives

Volz, Sébastian; Ordoñez-Miranda, José; Shchepetov, A.; Prunnila, Mika; Ahopelto, Jouni; Pézeril, Thomas; Vaudel, G.; Gusev, V.; Ruello, P.; Weig, Eva M.; Schubert, M.; Hettich, Mike; Grossman, Martin; Dekorsy, Thomas; Alzina, Francesc; Graczykowski, Bartłomiej; Chávez‐Ángel, Emigdio; Reparaz, J. S.; Wagner, Markus R.; Torres, C. M. Sotomayor; Xiong, Shiyun; Neogi, Sanghamitra; Donadio, Davide

doi:10.1140/epjb/e2015-60727-7

Cited by 169 publications

(155 citation statements)

References 299 publications

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“…Lett. 110, 011908 (2017) 10.1063/1.4973737 (accepted version) 2 Thermal transport in nanoscale materials is a very important research topic due to numerous temperature dependent applications of nanomaterials in various fields 1,2 . In particular, precise engineering of heat conduction in various nanomaterials is a crucial issue for fabrication of highly performant nano-devices and nano-systems.…”

Section: Arxiv:160908133mentioning

confidence: 99%

Anisotropic heat conduction in silicon nanowire network revealed by Raman scattering

Isaiev

Didukh

Nychyporuk

et al. 2017

Applied Physics Letters

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Anisotropic nanomaterials possess interesting thermal transport properties because they allow orientation of heat fluxes along preferential directions due to a high ratio (up to three orders of magnitude) between their in-plane and cross-plane thermal conductivities. Among different techniques allowing thermal conductivity evaluation, micro-Raman scattering is known to be one of the most efficient contactless measurement approaches. In this letter, an experimental approach based on Raman scattering measurements with variable laser spot sizes is reported. Correlation between experimental and calculated thermal resistances of one-dimensional nanocrystalline solids allows simultaneous estimation of their in-plane and cross-plane thermal conductivities. In particular, our measurement approach is illustrated to be applied for anisotropic thermal conductivity evaluation of silicon nanowire arrays.

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Section: Arxiv:160908133mentioning

confidence: 99%

Anisotropic heat conduction in silicon nanowire network revealed by Raman scattering

Isaiev

Didukh

Nychyporuk

et al. 2017

Applied Physics Letters

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“…While the thermal rectification has been first observed experimentally long ago, 4 recently it is attracting an increasing interest since it is a key feature in the emerging nanotechnology referred to as phononics. [5][6][7] Here, the generation, control, and manipulation of lattice heat (or, equivalently, phonon flux) are the main tools to engineer devices with functionality similar to their electronic counterparts (like electrical diodes or transistors).…”

Section: Introductionmentioning

confidence: 99%

Thermal rectification in silicon by a graded distribution of defects

Dettori

Melis

Rurali

et al. 2016

Journal of Applied Physics

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We discuss about computer experiments based on nonequilibrium molecular dynamics simulations providing evidence that thermal rectification can be obtained in bulk Si by a non-uniform distribution of defects. We consider a graded population of both Ge substitutional defects and nanovoids, distributed along the direction of an applied thermal bias, and predict a rectification factor comparable to what is observed in other low-dimensional Si-based nanostructures. By considering several defect distribution profiles, thermal bias conditions, and sample sizes, the present results suggest that a possible way for tuning the thermal rectification is by defect engineering. Published by AIP Publishing. [http://dx

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“…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.Controlling terahertz vibrations and heat transport in nanostructures has a broad impact on several applications, such as thermal management in micro-and nano-electronics, renewable energies harvesting, sensing, biomedical imaging and information and communication technologies [1][2][3][4][5][6][7][8]. Significant efforts have been made to understand and engineer heat transport in nanoscale silicon due to its natural abundance and technological relevance [9][10][11][12].…”

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confidence: 99%

Native surface oxide turns alloyed silicon membranes into nanophononic metamaterials with ultralow thermal conductivity

et al. 2017

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A detailed understanding of the relation between microscopic structure and phonon propagation at the nanoscale 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.Controlling terahertz vibrations and heat transport in nanostructures has a broad impact on several applications, such as thermal management in micro-and nano-electronics, renewable energies harvesting, sensing, biomedical imaging and information and communication technologies [1][2][3][4][5][6][7][8]. Significant efforts have been made to understand and engineer heat transport in nanoscale silicon due to its natural abundance and technological relevance [9][10][11][12]. In the past decade researchers explored strategies to obtain silicon based materials with low thermal conductivity (TC) and unaltered electronic transport coefficients, so to achieve high thermoelectric figure of merit and enable silicon-based thermoelectric technology [11][12][13][14][15][16][17][18].From the earlier studies it was recognized that lowdimensional silicon nanostructures, such as nanowires, thin films and nano membranes feature a largely reduced TC, up to 50 times lower than that of bulk at room temperature. TC reduction becomes more prominent with the reduction of the characteristic dimension of the nanostructures [19][20][21][22]. Theory and experiments consistently show that surface disorder and the presence of disordered material at surfaces play a major role in determining the TC of nanostructures [12,[23][24][25]. However, a comprehensive understanding of the physical mechanisms underlying so large TC reduction is lacking. The effect of surface roughness and surface disorder on phonons has been so far interpreted in terms of phonon scattering [26][27][28][29][30], but scattering would not account for mean free path reduction of long-wavelength low-frequency modes. Recent theoretical work demonstrated that surface nanostructures, such as nanopillars at the surface of thin films or nanowires, can efficiently reduce TC through resonances, a mechanism that is intrinsically different from scattering [31,32]. Surface resonances alter directly phonon dispersion relations by hybridizing with prop...

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Nanophononics: state of the art and perspectives

Cited by 169 publications

References 299 publications

Anisotropic heat conduction in silicon nanowire network revealed by Raman scattering

Anisotropic heat conduction in silicon nanowire network revealed by Raman scattering

Thermal rectification in silicon by a graded distribution of defects

Native surface oxide turns alloyed silicon membranes into nanophononic metamaterials with ultralow thermal conductivity

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