Lattice thermal conduction in ultra-thin nanocomposites

Thomas, Iorwerth O.; Srivastava, G. P.

doi:10.1063/1.4954678

Cited by 4 publications

(2 citation statements)

References 59 publications

(99 reference statements)

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“…Molecular dynamics simulations by Landry et al [19] and the ab initio work by Garg and Chen [20] using the single-mode relaxation time approximation of the Boltzmann transport equation clearly show that the crossplane κ in SiGe SLs of thin periodicities fall below the alloy limit. A semi-empirical study [21] also confirmed that these systems exhibit promise, however it relies on the tuning of scattering parameters against experimental results. It therefore lacks a degree of predictive power.…”

Section: Introductionmentioning

confidence: 88%

Mode confinement, interface mass-smudging, and sample length effects on phonon transport in thin nanocomposite superlattices

Srivastava

Thomas

2018

J. Phys.: Condens. Matter

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We employ a semi-ab initio theoretical method to investigate mode confinement, interface mass-smudging, and sample length effects on phonon transport in thin nanocomposite superlattices. We present a detailed comparative study of numerical results showing the reduction in thermal conductivity due to each of these three effects for Si/Ge nanocomposite structures with planar superlattice (SL), embedded nanowire superlattice (NWSL), and embedded nanodot superlattice (NDSL) geometries. Importantly, it is found that any of these three types of thin period systems, with small amounts of interface mass smudging, can exhibit a room-temperature conductivity significantly lower than the SiGe alloy conductivity, providing strong evidence that they could be used as efficient thermoelectric materials. It is also found that the room-temperature conductivity of each of the nanocomposite superlattices shows a weaker sample size dependence than do the component bulk conductivities.

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Section: Introductionmentioning

confidence: 88%

Mode confinement, interface mass-smudging, and sample length effects on phonon transport in thin nanocomposite superlattices

Srivastava

Thomas

2018

J. Phys.: Condens. Matter

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“…Hijazi and Kazan [5] presented a predictive Boltzmann model for the cross-plane thermal conductivity in superlattices. Si-Ge superlattices doped by SiGe and Ge nanodots were also studied theoretically, and the results manifested the contributions of nanodots to limiting the thermal conductivities [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Thermal Transport in Silicon-Germanium Superlattices at Low Temperatures

Wang

Cai

Tiezhu

2019

Journal of Nanomaterials

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Interfacial thermal resistances between heterogeneous materials are still a challengeable subject since the mechanism to explain it quantitatively is not clear in spite of its importance. We propose a Monte Carlo (MC) model to study phonon interfacial elastic and inelastic scattering behaviors for superlattices composed of Si and Ge materials, which substantially reduces the amount of computations. In particular, below Debye temperatures, the molecular dynamics (MD) solution is not precise enough for semiconductors because of quantization errors. In this work, thermal conductivities and thermal rectifications of Si/Ge and Ge/Si superlattices with different periods are investigated separately at temperatures below 200 K.

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Ligand Engineering Achieves Suppression of Temperature Quenching in Pure Green Perovskite Nanocrystals for Efficient and Thermostable Electroluminescence

Chen,

Du,

Cao

et al. 2024

Nano-Micro Lett.

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Formamidinium lead bromide (FAPbBr3) perovskite nanocrystals (NCs) are promising for display and lighting due to their ultra-pure green emission. However, the thermal quenching will exacerbate their performance degradation in practical applications, which is a common issue for halide perovskites. Here, we reported the heat-resistant FAPbBr3 NCs prepared by a ligand-engineered room-temperature synthesis strategy. An aromatic amine, specifically β-phenylethylamine (PEA) or 3-fluorophenylethylamine (3-F-PEA), was incoporated as the short-chain ligand to expedite the crystallization rate and control the size distribution of FAPbBr3 NCs. Employing this ligand engineering approach, we synthesized high quality FAPbBr3 NCs with uniform grain size and reduced long-chain alkyl ligands, resulting in substantially suppressed thermal quenching and enhanced carrier transportation in the perovskite NCs films. Most notably, more than 90% of the room temperature PL intensity in the 3-F-PEA modified FAPbBr3 NCs film was preserved at 380 K. Consequently, we fabricated ultra-pure green EL devices with a room temperature external quantum efficiency (EQE) as high as 21.9% at the luminance of above 1,000 cd m−2, and demonstrated less than 10% loss in EQE at 343 K. This study introduces a novel room temperature method to synthesize efficient FAPbBr3 NCs with exceptional thermal stability, paving the way for advanced optoelectronic device applications.

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Lattice thermal conduction in ultra-thin nanocomposites

Cited by 4 publications

References 59 publications

Mode confinement, interface mass-smudging, and sample length effects on phonon transport in thin nanocomposite superlattices

Mode confinement, interface mass-smudging, and sample length effects on phonon transport in thin nanocomposite superlattices

Thermal Transport in Silicon-Germanium Superlattices at Low Temperatures

Ligand Engineering Achieves Suppression of Temperature Quenching in Pure Green Perovskite Nanocrystals for Efficient and Thermostable Electroluminescence

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