Thermal conduction in amorphous/crystalline silicon superlattices: a molecular dynamics study of the size, temperature, and strain effect

Gu, Hongfang; Chen, Kedong; Wang, Hairong; Li, Zhibin; Wang, Jiuhong; Wei, Xueyong

doi:10.1088/2053-1591/ab469b

Cited by 4 publications

(6 citation statements)

References 36 publications

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“…It is not only the change of interfacial thermal resistance but also the materials on both sides of the interface that cause the change of thermal conductivity [17]. According to the literatures [4,24], the changes of materials on both sides with strain are not consistent.…”

Section: The Effect Of Strain On the Thermal Conductionmentioning

confidence: 98%

“…According to different kinds of materials [28], the strain effect remains controversial. The effects of strain on superlattice and heterostructure were also reported [17,[29][30][31]. The internal strain in literature [31] was caused by interface mismatch during material preparation.…”

Section: Introductionmentioning

confidence: 94%

“…constructed amorphous/crystalline silicon superlattices and nanowires. Our previous work [17] also discussed the size, temperature, and strain effect on the thermal conduction in amorphous/crystalline silicon superlattices. Bazrafshan et al [18].…”

Section: Introductionmentioning

confidence: 99%

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Thermal conductivity and interfacial thermal resistance in the heterostructure of silicon/amorphous silicon dioxide: the strain and temperature effect

Gu¹,

Wang²,

Wei³

et al. 2020

Nanotechnology

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This article reports the thermal conduction properties of Si/a-SiO2 heterostructure with two different interfaces: weak and strong coupling strength through molecular dynamics simulation. The size and temperature dependencies on the interfacial thermal resistance of the weak coupling interface are larger than those of the strong coupling interface. The thermal conduction in Si/a-SiO2 shows strong anisotropy. The thermal conductivity, interfacial thermal resistance, and enhancement of the anisotropy can be modulated by changing the strains applied to the heterostructures. This work provides an optional way to design the silicon-based heterostructures considering heat insulation and heat dissipation.

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Section: The Effect Of Strain On the Thermal Conductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 94%

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Thermal conductivity and interfacial thermal resistance in the heterostructure of silicon/amorphous silicon dioxide: the strain and temperature effect

Gu¹,

Wang²,

Wei³

et al. 2020

Nanotechnology

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“…The glass‐like temperature dependence can be understood in terms of a dominant role of boundary scattering and diffusive vibrational modes, as already reported in theoretical studies on amorphous/crystalline nanocomposites. [ 16,60,61 ] Indeed, not only the diffusive contribution from optic modes becomes more important in GTC9 with respect to GeTe, but also, similarly to the molecular dynamics studies, an excess intensity is found in the density of states at wavelengths comparable with the nanostructure lengthscale, suggesting that acoustic modes with those energies are strongly scattered by the elastic nanoheterogeneities and loose their propagative character contributing thus diffusively to thermal transport. In order to definitely confirm this interpretation, it is necessary to obtain a direct measurement of phonon attenuation at wavelengths between 2 and 20 nm, for which other experimental techniques are needed.…”

Section: Discussionmentioning

confidence: 58%

Glass‐Like Phonon Dynamics and Thermal Transport in a GeTe Nano‐Composite at Low Temperature

Cravero,

Tlili,

Paterson

et al. 2024

Small

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In this work, the experimental evidence of glass‐like phonon dynamics and thermal conductivity in a nanocomposite made of GeTe and amorphous carbon is reported, which is of interest for microelectronics, and specifically phase change memories. It is shown that, the total thermal conductivity is reduced by a factor of three at room temperature with respect to pure GeTe, due to the reduction of both electronic and phononic contributions. This latter, similarly to glasses, is small and weakly increasing with temperature between 100 and 300 K, indicating a mostly diffusive thermal transport and reaching a value of 0.86(7) Wm−1K−1 at room temperature. A thorough investigation of the nanocomposite's phonon dynamics reveals the appearance of an excess intensity in the low energy vibrational density of states, reminiscent of the Boson peak in glasses. These features can be understood in terms of an enhanced phonon scattering at the interfaces, due to the presence of elastic heterogeneities, at wavelengths in the 2–20 nm range. The findings confirm recent simulation results on crystalline/amorphous nanocomposites and open new perspectives in phonon and thermal engineering through the direct manipulation of elastic heterogeneities.

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“…69 Subsequent studies on amorphous-crystalline interfaces with MD have mostly focused on their thermal transport properties as a function of the lattice size, temperature, and strain. 70,71 Furthermore, the materials considered for the study have been limited to the semiconducting elements silicon and germanium, which can show crystalline and amorphous phases, with the primary focus being on thermoelectric applications of these heterostructures. This thermal boundary property was further explored using a robust machine learning model based on Green's function solutions.…”

Section: The Synergy In Amorphouscrystalline Heterostructuresmentioning

confidence: 99%

A critical review on amorphous–crystalline heterostructured electrocatalysts for efficient water splitting

Singh,

Cha,

Singh

et al. 2023

Mater. Chem. Front.

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Thermal conduction in amorphous/crystalline silicon superlattices: a molecular dynamics study of the size, temperature, and strain effect

Cited by 4 publications

References 36 publications

Thermal conductivity and interfacial thermal resistance in the heterostructure of silicon/amorphous silicon dioxide: the strain and temperature effect

Thermal conductivity and interfacial thermal resistance in the heterostructure of silicon/amorphous silicon dioxide: the strain and temperature effect

Glass‐Like Phonon Dynamics and Thermal Transport in a GeTe Nano‐Composite at Low Temperature

A critical review on amorphous–crystalline heterostructured electrocatalysts for efficient water splitting

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