Nanoslot Patterns for Enhanced Thermal Anisotropy of Si Thin Films

Xiao, Yue; Hao, Qing

doi:10.1016/j.ijheatmasstransfer.2021.120944

Cited by 10 publications

(4 citation statements)

References 44 publications

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“…A few theoretical works have predicted that phononic nanostructures facilitate anisotropic in-plane thermal conduction, underlining their potential in the thermal management of electronic devices. 28,29 However, anisotropic in-plane thermal conduction in phononic nanostructures remains unexplored despite their design capability and material selectivity.…”

Section: Introductionmentioning

confidence: 99%

“…Such phonon-dispersion-driven anisotropy was confirmed not only for few-layered structures but also for the nanoribbon of black phosphorus, extending potential applications. A few theoretical works have predicted that phononic nanostructures facilitate anisotropic in-plane thermal conduction, underlining their potential in the thermal management of electronic devices. , However, anisotropic in-plane thermal conduction in phononic nanostructures remains unexplored despite their design capability and material selectivity.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropy Reversal of Thermal Conductivity in Silicon Nanowire Networks Driven by Quasi-Ballistic Phonon Transport

Kim,

Barbier-Chebbah,

Ogawara

et al. 2024

ACS Nano

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Nanostructured semiconductors promise functional thermal management for microelectronics and thermoelectrics through a rich design capability. However, experimental studies on anisotropic in-plane thermal conduction remain limited, despite the demand for directional heat dissipation. Here, inspired by an oriental wave pattern, a periodic network of bent wires, we investigate anisotropic inplane thermal conduction in nanoscale silicon phononic crystals with the thermally dead volume. We observed the anisotropy reversal of the material thermal conductivity from 1.2 at 300 K to 0.8 at 4 K, with the reversal temperature of 80 K mediated by the transition from a diffusive to a quasi-ballistic regime. Our Monte Carlo simulations revealed that the backflow of the directional phonons induces the anisotropy reversal, showing that the quasi-ballistic phonon transport introduces preferential thermal conduction channels with anomalous temperature dependence. Accordingly, the anisotropy of the effective thermal conductivity varied from 2.7 to 5.0 in the range of 4−300 K, indicating an anisotropic heat manipulation capability. Our findings demonstrate that the design of nanowire networks enables the directional thermal management of electronic devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anisotropy Reversal of Thermal Conductivity in Silicon Nanowire Networks Driven by Quasi-Ballistic Phonon Transport

Kim,

Barbier-Chebbah,

Ogawara

et al. 2024

ACS Nano

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show abstract

“…The effective control or manipulation of heat flow is an evolving research field combining transformation thermodynamics and metamaterials [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24]. Following this concept, a class of novel thermal metadevices, i.e.…”

Section: Introductionmentioning

confidence: 99%

Deep learning based design of thermal metadevices

Chen

Liang

Fang

et al. 2022

International Journal of Heat and Mass Transfer

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“…Among various patterns, long and narrow rectangular nanopores (i.e., nanoslots) exhibit great potentials in thermal designs, i.e., a smaller neck width w between adjacent nanoslots to yield a smaller L C ( Hao and Xiao, 2020 ; Hao et al., 2019 ). This L C can be further reduced by offsetting adjacent rows of nanoslots ( Figure 1 A), which also adjusts the in-plane thermal anisotropy of a thin film ( Xiao and Hao, 2021 ). Perpendicular to the overall heat flow direction, the pitch p is fixed at 500 nm for all devices.…”

Section: Introductionmentioning

confidence: 99%