Giant reduction of thermal conductivity and enhancement of thermoelectric performance in twinning superlattice InAsSb nanowires

Peri, Lorenzo; Prete, Domenic; Demontis, Valeria; Zannier, Valentina; Rossi, Francesca; Sorba, L.; Beltram, Fabio; Rossella, Francesco

doi:10.1016/j.nanoen.2022.107700

Cited by 11 publications

(14 citation statements)

References 37 publications

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“…In the subsequent sections we shall briefly retrace the analytical approach to the 3ω method as presented in [24], to The model of the best fit and its validity are discussed at length in section 2. Data taken as described in [2] introduce the relevant physical quantities and adimensional transport numbers. This will allow for a discussion of the inherent limitations of the often-used analytical treatment, and highlight the approximations which can be lifted via a Finite Element Modelling (FEM) approach.…”

Section: Theory Of the 3ω Problemmentioning

confidence: 99%

“…The thermoelectric performance of a specimen can be shown to depend on an adimensional quantity, named the thermoelectric figure of merit, which depends on the ratio between the electric and thermal conductivity of the material chosen for the thermoelectric device. The recently-demonstrated ability to engineer semiconducting nanowires (NWs) to lower their thermal conductivity without affecting their electrical transport properties [1][2][3][4][5][6][7]-a promising feature coming from phonon scattering with the boundaries of the nanostructure, i.e. the Casimir effect [8]-has made them an extremely interesting platform to realize high room-temperature figures of merit, to rival those of more-established industry standard thermoelectric materials (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Measuring thermal conductivity of nanostructures with the 3ω method: the need for finite element modeling

et al. 2023

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Conventional techniques of measuring thermal transport properties may be unreliable or unwieldy when applied to nanostructures. However, a simple, all-electrical technique is available for all samples featuring high-aspect-ratio: the 3ω method. However, its usual formulation relies on simple analytical results which may break down in real experimental conditions. In this work we clarify these limits and quantify them via adimensional numbers and present a more accurate, numerical solution to the 3ω problem based on the Finite Element Method (FEM). Finally, we present a comparison of the two methods on experimental datasets from InAsSb nanostructures with different thermal transport properties, to stress the crucial need of a FEM counterpart to 3ω measurements in nanostructures with low thermal conductivity.

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Section: Theory Of the 3ω Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measuring thermal conductivity of nanostructures with the 3ω method: the need for finite element modeling

et al. 2023

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“…The key parameters of thermoelectric thin film are the Seebeck coefficient and electrical conductivity, which determines the power factor ( PF = S 2 σ ), an evaluation of the output power efficiency of the thermoelectric thin film [ 3 ]. With the progressive miniaturization of energy and energy storage devices, this has spurred the development of thin films, which are increasingly replacing bulk materials in applications, as the thin film can better meet the miniaturization and flexibility requirements of its devices [ 2 , 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Si Substrates with Variable Initial Orientations on the Growth and Thermoelectric Properties of Bi-Sb-Te Thin Films

Zhang

Zheng

et al. 2023

Nanomaterials

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For thermoelectric thin film, the substrate plays an important role during the growing process and produces effects on its thermoelectric properties. Some special kinds of substrates provide an optimal combination of influences on both the structure and thermoelectric properties. In this work, Bi-Sb-Te films are deposited on Si substrates with different initial orientations by magnetron sputtering in two ways: with and without a pre-coating process. The preferred orientations of the Bi-Sb-Te films are greatly affected by the substrates, in which the thin film tends to deposit on Si substrate with (100) initial orientation and high (015)-texture, while the (00l)-textured Bi-Sb-Te film easily deposits on Si substrate with (110) initial orientation. The experimental and theoretical calculation results indicate that Bi-Sb-Te film with (00l)-texture presents good electrical conductivity and a higher power factor than that of film with (015)-texture.

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“…This makes SL NWs an ideal platform to envisage and study phonon engineering at the nanoscale for controlled heat transport. In recent years, there has been an increase in both the theoretical and experimental studies of SL NWs with a focus on their thermal properties. ,− Most of the work done in NW SLs from the perspective of phonon engineering explores twinning or crystal phase SLs. In this work, we study the phononic properties of SL NWs made of two different constituent materials: GaAs and GaP.…”

Section: Introductionmentioning

confidence: 99%

GaAs/GaP Superlattice Nanowires for Tailoring Phononic Properties at the Nanoscale: Implications for Thermal Engineering

K. Sivan,

Abad,

Albrigi

et al. 2023

ACS Appl. Nano Mater.

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The possibility to tune the functional properties of nanomaterials is key to their technological applications. Superlattices, i.e., periodic repetitions of two or more materials in one or more dimensions, are being explored for their potential as materials with tailor-made properties. Meanwhile, nanowires offer a myriad of possibilities to engineer systems at the nanoscale, as well as to combine materials that cannot be put together in conventional heterostructures due to the lattice mismatch. In this work, we investigate GaAs/GaP superlattices embedded in GaP nanowires and demonstrate the tunability of their phononic and optoelectronic properties by inelastic light scattering experiments corroborated by ab initio calculations. We observe clear modifications in the dispersion relation for both acoustic and optical phonons in the superlattices nanowires. We find that by controlling the superlattice periodicity, we can achieve tunability of the phonon frequencies. We also performed wavelength-dependent Raman microscopy on GaAs/GaP superlattice nanowires, and our results indicate a reduction in the electronic bandgap in the superlattice compared to the bulk counterpart. All of our experimental results are rationalized with the help of ab initio density functional perturbation theory (DFPT) calculations. This work sheds fresh insights into how material engineering at the nanoscale can tailor phonon dispersion and open pathways for thermal engineering.

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Giant reduction of thermal conductivity and enhancement of thermoelectric performance in twinning superlattice InAsSb nanowires

Cited by 11 publications

References 37 publications

Measuring thermal conductivity of nanostructures with the 3ω method: the need for finite element modeling

Measuring thermal conductivity of nanostructures with the 3ω method: the need for finite element modeling

Effects of Si Substrates with Variable Initial Orientations on the Growth and Thermoelectric Properties of Bi-Sb-Te Thin Films

GaAs/GaP Superlattice Nanowires for Tailoring Phononic Properties at the Nanoscale: Implications for Thermal Engineering

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