Quantum Effects in the Thermoelectric Power Factor of Low-Dimensional Semiconductors

Hung, Nguyen Tuan; Hasdeo, Eddwi H.; Nugraha, Ahmad R. T.; Dresselhaus, M. S.; Saito, Riichiro

doi:10.1103/physrevlett.117.036602

Cited by 139 publications

(123 citation statements)

References 27 publications

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“…By measuring thickness dependent TE properties in InSe, Zeng et al have recently shown that the power factor increases greatly due to the sharper edge of the conduction‐band DOS caused by quantum confinement and a Seebeck coefficient up to 570 µV K −1 in 7 nm InSe sample has been reported. Further analysis shows that power factor in InSe would be increased significantly when the confined dimension is smaller than the thermal de Broglie wavelength, a scenario estimated by theoretical calculation . When the confined length increases beyond than the thermal de Broglie wavelength, the power factor decreases gradually toward the value for bulk InSe, which is shown in Figure .…”

Section: Phonon‐driven Emerging Applications Of 2d Semiconductorsmentioning

confidence: 72%

Thermal Transport in 2D Semiconductors—Considerations for Device Applications

Zhao

Cai

Zhang

et al. 2019

Adv Funct Materials

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The discovery of graphene has stimulated the search for and investigations into other 2D materials because of the rich physics and unusual properties exhibited by many of these layered materials. Transition metal dichalcogenides (TMDs), black phosphorus, and SnSe among many others, have emerged to show highly tunable physical and chemical properties that can be exploited in a whole host of promising applications. Alongside the novel electronic and optical properties of such 2D semiconductors, their thermal transport properties have also attracted substantial attention. Here, a comprehensive review of the unique thermal transport properties of various emerging 2D semiconductors is provided, including TMDs, black‐ and blue‐phosphorene among others, and the different mechanisms underlying their thermal conductivity characteristics. The focus is placed on the phonon‐related phenomena and issues encountered in various applications based on 2D semiconductor materials and their heterostructures, including thermoelectric power generation and electron–phonon coupling effect in photoelectric and thermal transistor devices. A thorough understanding of phonon transport physics in 2D semiconductor materials to inform thermal management of next‐generation nanoelectronic devices is comprehensively presented along with strategies for controlling heat energy transport and conversion.

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Section: Phonon‐driven Emerging Applications Of 2d Semiconductorsmentioning

confidence: 72%

Thermal Transport in 2D Semiconductors—Considerations for Device Applications

Zhao

Cai

Zhang

et al. 2019

Adv Funct Materials

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“…From the 1990s, the introduction of nanostructures has shown a promising way to independently control S , σ , and

κ_{c}

[1] through quantum confinement effect, and to reduce the lattice thermal conductivity

κ_{p}

due to the phonon-interface scattering [1,32,33,34] for the next generation of high efficiency TE materials. For example, ZT ≈ 2.4 at room temperature has been reported by Venkatasubramanian et al [35] in p -type Bi 2 Te 3 /Sb 2 Te 3 thin film TE materials.…”

Section: Introduction To Thermoelectricitymentioning

confidence: 99%

Thermoelectric Transport in Nanocomposites

Liu

Zhou

et al. 2017

Materials

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Thermoelectric materials which can convert energies directly between heat and electricity are used for solid state cooling and power generation. There is a big challenge to improve the efficiency of energy conversion which can be characterized by the figure of merit (ZT). In the past two decades, the introduction of nanostructures into bulk materials was believed to possibly enhance ZT. Nanocomposites is one kind of nanostructured material system which includes nanoconstituents in a matrix material or is a mixture of different nanoconstituents. Recently, nanocomposites have been theoretically proposed and experimentally synthesized to be high efficiency thermoelectric materials by reducing the lattice thermal conductivity due to phonon-interface scattering and enhancing the electronic performance due to manipulation of electron scattering and band structures. In this review, we summarize the latest progress in both theoretical and experimental works in the field of nanocomposite thermoelectric materials. In particular, we present various models of both phonon transport and electron transport in various nanocomposites established in the last few years. The phonon-interface scattering, low-energy electrical carrier filtering effect, and miniband formation, etc., in nanocomposites are discussed.

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“…In 2016, Dresselhaus et al proposed that the PF can be dramatically improved by minimizing the quantum well thickness/ λ D ratio in a 2D quantum well system . Thus, we hypothesized that the use of longer λ D should be effective if the carrier electrons are confined within a fixed layer thickness (Figure ).…”

Section: Introductionmentioning

confidence: 83%

“…Hicks and Dresselhaus predicted dramatical enhancements in ZT in 2DES. In semiconductors, 2DES can be realized by quantum well structures in superlattices, and the quantum well structures significantly increase the magnitude of S value due to an increase in the density of states (DOS) near the conduction band edge . This model is based on the assumption that the carrier electrons confined in such a narrow space will not experience reductions in the electrical carrier mobility/conductivity.…”

Section: Introductionmentioning

confidence: 99%

Electron Sandwich Doubles the Thermoelectric Power Factor of SrTiO₃

Zhang

Ohta

2019

Physica Status Solidi (a)

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Thermoelectric materials convert a temperature difference into electricity through a phenomenon known as the Seebeck effect, and their efficiency is determined by the dimensionless figure of merit, ZT (≡ S2 · σ · κ−1). Currently, most materials exhibiting high ZT values (ZT > 1) are based on heavy metal compounds, but these materials have low thermal/chemical stability. In this regard, conducting metal oxides attract much attention for thermoelectric power generations at high temperatures based on their advantages in thermal stability over heavy metal compounds. However, the thermoelectric performance of metal oxides is usually low. Here the authors review that an enhanced two‐dimensionality is efficient for enhancing the thermoelectric power factor of metal oxides. The authors fabricate SrTiO3‐based superlattices of [N unit cell SrTi1−xNbxO3|11 unit cell SrTiO3]10, of which the de Broglie wavelengths can be tuned by the substitution of Nb. The maximum power factor of the superlattice composed of the long de Broglie wavelength SrTi1−xNbxO3 exceeds ≈5 mW m−1 K−2, which doubles the value observed from the optimized bulk SrTi1−xNbxO3. This finding can help to reduce the amount of wasted heat and thus wasted fossil fuel in daily activities and industrial factories.

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Quantum Effects in the Thermoelectric Power Factor of Low-Dimensional Semiconductors

Cited by 139 publications

References 27 publications

Thermal Transport in 2D Semiconductors—Considerations for Device Applications

Thermal Transport in 2D Semiconductors—Considerations for Device Applications

Thermoelectric Transport in Nanocomposites

Electron Sandwich Doubles the Thermoelectric Power Factor of SrTiO₃

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Quantum Effects in the Thermoelectric Power Factor of Low-Dimensional Semiconductors

Cited by 139 publications

References 27 publications

Thermal Transport in 2D Semiconductors—Considerations for Device Applications

Thermal Transport in 2D Semiconductors—Considerations for Device Applications

Thermoelectric Transport in Nanocomposites

Electron Sandwich Doubles the Thermoelectric Power Factor of SrTiO3

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Product

Resources

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Electron Sandwich Doubles the Thermoelectric Power Factor of SrTiO₃