Recent progress and futuristic development of PbSe thermoelectric materials and devices

Gayner, Chhatrasal; Kar, Kamal K.; Kim, Woochul

doi:10.1016/j.mtener.2018.06.010

Cited by 63 publications

(28 citation statements)

References 114 publications

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“…The challenge has been to improve the low efficiency of the energy conversion process, which is characterized by the dimensionless figure of merit, zT , defined as the ratio of the electronic power factor and the thermal conductivity of the thermoelectric material 1 . Lead chalcogenides make good thermoelectric materials 2–7 because they have both high electronic power factors and low thermal conductivities owing to strongly anharmonic lattice dynamics 8–12 . An important strategy for improving the figure of merit is to reduce the phonon contribution to thermal transport while keeping the electrical conductivity unchanged, i.e., using the “phonon glass-electron crystal” approach 13–15 .…”

Section: Introductionmentioning

confidence: 99%

Intrinsic anharmonic localization in thermoelectric PbSe

et al. 2019

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Lead chalcogenides have exceptional thermoelectric properties and intriguing anharmonic lattice dynamics underlying their low thermal conductivities. An ideal material for thermoelectric efficiency is the phonon glass–electron crystal, which drives research on strategies to scatter or localize phonons while minimally disrupting electronic-transport. Anharmonicity can potentially do both, even in perfect crystals, and simulations suggest that PbSe is anharmonic enough to support intrinsic localized modes that halt transport. Here, we experimentally observe high-temperature localization in PbSe using neutron scattering but find that localization is not limited to isolated modes – zero group velocity develops for a significant section of the transverse optic phonon on heating above a transition in the anharmonic dynamics. Arrest of the optic phonon propagation coincides with unusual sharpening of the longitudinal acoustic mode due to a loss of phase space for scattering. Our study shows how nonlinear physics beyond conventional anharmonic perturbations can fundamentally alter vibrational transport properties.

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Section: Introductionmentioning

confidence: 99%

Intrinsic anharmonic localization in thermoelectric PbSe

et al. 2019

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“…PbTe and PbSe are known to be excellent thermoelectric materials and many studies focused on different aspects playing a role in their good performance. [36][37][38] This study highlights the importance of the unique degree of electron-sharing and transfer characteristic for metavalent materials, which is also important for the thermoelectric performance since it determines the magnitude of the Seebeck coefficient (S = 0 for metals, i.e., the electrons are too delocalized for a high performance) and the electrical conductivity (insulators, where the electrons are too localized, possess a large Seebeck coefficient, but have too low electrical conductivities to compete with highperformance thermoelectrics). [8,39] PbTe and Bi 2 Te 3 (also metavalent) [19] are the two leading thermoelectric materials in both research and development (cf.…”

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confidence: 99%

Discovering Electron‐Transfer‐Driven Changes in Chemical Bonding in Lead Chalcogenides (PbX, where X = Te, Se, S, O)

et al. 2020

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Understanding chemical bonding is of significant interest since it allows us to comprehend and tailor certain material properties, [1,2] which could be utilized, e.g., to optimize phase-change materials (PCMs) [3-7] or thermoelectrics. [8,9] The first steps to understand the nature of the chemical bond were already taken almost a century ago by Linus Pauling [10] and others. [11,12] In the meantime, enormous developments have taken place in both, quantum-mechanical and experimental techniques, [13-15] which help us to explore chemical bonding with unprecedented detail. Recently, these advances have also led to the concept of metavalent bonding (MVB), describing a bonding mechanism in between electron delocalization (i.e., metallic bonding) and electron localization at the ion cores (i.e., ionic bonding) as well as within the interatomic region (i.e., covalent bonding). [16-18] Metavalent bonding has been categorized by combining both quantummechanical and experimentally accessible bonding descriptors. [16-18] The Understanding the nature of chemical bonding in solids is crucial to comprehend the physical and chemical properties of a given compound. To explore changes in chemical bonding in lead chalcogenides (PbX, where X = Te, Se, S, O), a combination of property-, bond-breaking-, and quantummechanical bonding descriptors are applied. The outcome of the explorations reveals an electron-transfer-driven transition from metavalent bonding in PbX (X = Te, Se, S) to iono-covalent bonding in β-PbO. Metavalent bonding is characterized by adjacent atoms being held together by sharing about a single electron (ES ≈ 1) and small electron transfer (ET). The transition from metavalent to iono-covalent bonding manifests itself in clear changes in these quantum-mechanical descriptors (ES and ET), as well as in property-based descriptors (i.e., Born effective charge (Z*), dielectric function ε(ω), effective coordination number (ECoN), and mode-specific Grüneisen parameter (γ TO)), and in bond-breaking descriptors. Metavalent bonding collapses if significant charge localization occurs at the ion cores (ET) and/or in the interatomic region (ES). Predominantly changing the degree of electron transfer opens possibilities to tailor material properties such as the chemical bond (Z*) and electronic (ε ∞) polarizability, optical bandgap, and optical interband transitions characterized by ε 2 (ω). Hence, the insights gained from this study highlight the technological relevance of the concept of metavalent bonding and its potential for materials design.

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“…The efficiencies of thermoelectric materials are measured in terms of well-defined dimensionless factor ZT, which is known as the figure of merit [ 1 ] and given by:

where

is the Seebeck coefficient,

is the electrical resistivity,

is the thermal conductivity, and T is the absolute temperature. Few thermoelectric materials such as PbTe and SiGe have shown figure of merit (ZT) values of around 2 [ 2 , 3 ]. Existing commercial-based thermoelectric generators (TEGs) are mostly bismuth-based and are predominantly used for localized heating, cooling, and deep space applications.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Performance of Large-Scale Cost-Effective Environment-Friendly Nanostructured Thermoelectric Materials

2021

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Thermoelectricity is a promising technology that directly converts heat energy into electricity and finds its use in enormous applications. This technology can be used for waste heat recovery from automobile exhausts and industrial sectors and convert the heat from solar energy, especially in hot and humid areas such as Qatar. The large-scale, cost-effective commercialization of thermoelectric generators requires the processing and fabrication of nanostructured materials with quick, easy, and inexpensive techniques. Moreover, the methods should be replicable and reproducible, along with stability in terms of electrical, thermal, and mechanical properties of the TE material. This report summarizes and compares the up-to-date technologies available for batch production of the earth-abundant and ecofriendly materials along with some notorious works in this domain. We have also evaluated and assessed the pros and cons of each technique and its effect on the properties of the materials. The simplicity, time, and cost of each synthesis technique have also been discussed and compared with the conventional methods.

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Recent progress and futuristic development of PbSe thermoelectric materials and devices

Cited by 63 publications

References 114 publications

Intrinsic anharmonic localization in thermoelectric PbSe

Intrinsic anharmonic localization in thermoelectric PbSe

Discovering Electron‐Transfer‐Driven Changes in Chemical Bonding in Lead Chalcogenides (PbX, where X = Te, Se, S, O)

Synthesis and Performance of Large-Scale Cost-Effective Environment-Friendly Nanostructured Thermoelectric Materials

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