Recrystallization induced in situ nanostructures in bulk bismuth antimony tellurides: a simple top down route and improved thermoelectric properties

Shen, Jizhong; Zhu, Tiejun; Zhao, Xinbing; Zhang, Shengnan; Yang, Shenghui; Yin, Zhaozheng

doi:10.1039/c0ee00012d

Cited by 189 publications

(165 citation statements)

References 20 publications

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“…[80] According to solid state physical principles, the ZT value for bulk mate rials with a single parabolic band (SPB) along a certain direc tion can be given as: [4] The timeline for thermoelectric bulk materials with 2D structures, showing data from a superlattice, [8] SnSe, [11,[19][20][21] Bi 2 Te 3 , [12,14,16,17,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] BiCuSeO, [12,[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56] Na x CoO 2 , [57,58] Ca 3 Co 4 O 9 , [5...…”

Section: Strategies From Artificial Superlatticesmentioning

confidence: 99%

Promising Thermoelectric Bulk Materials with 2D Structures

2017

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Given that more than two thirds of all energy is lost, mostly as waste heat, in utilization processes worldwide, thermoelectric materials, which can directly convert waste heat to electricity, provide an alternative option for optimizing energy utilization processes. After the prediction that superlattices may show high thermoelectric performance, various methods based on quantum effects and superlattice theory have been adopted to analyze bulk materials, leading to the rapid development of thermoelectric materials. Bulk materials with two‐dimensional (2D) structures show outstanding properties, and their high performance originates from both their low thermal conductivity and high Seebeck coefficient due to their strong anisotropic features. Here, the advantages of superlattices for enhancing the thermoelectric performance, the transport mechanism in bulk materials with 2D structures, and optimization methods are discussed. The phenomenological transport mechanism in these materials indicates that thermal conductivities are reduced in 2D materials with intrinsically short mean free paths. Recent progress in the transport mechanisms of Bi2Te3‐, SnSe‐, and BiCuSeO‐based systems is summarized. Finally, possible research directions to enhance the thermoelectric performance of bulk materials with 2D structures are briefly considered.

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Section: Strategies From Artificial Superlatticesmentioning

confidence: 99%

Promising Thermoelectric Bulk Materials with 2D Structures

2017

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“…3,38,40 Hence, the HD-induced microstructures, especially the atomic-scale and nanometer-scale microstructures, are worth further scrutiny. We found two noteworthy microstructural features, one at the nanoscale and one at the atomic scale.…”

Section: Thermal Conductivity and Microstructurementioning

confidence: 99%

“…Additional experimental details of HD processing can be found elsewhere. 3,23,38,40,41 Finally, disk-shaped hot deformed samples of 20 mm were acquired and named HD-In x . All of the samples have similar densities of~95% of the theoretical values.…”

Section: Introductionmentioning

confidence: 99%

“…Third, HD-induced dislocations and other lattice distortions, along with intrinsic and extrinsic point defects, scatter the short-wavelength (high-frequency) phonons. 3,38,40 Defects V 000 Bi (or V 000 Sb ) and V Te are effective scatters of short-wavelength (high-frequency) phonons because of the larger mass and size differences between the occupied sites and the vacancies. 32,44 Therefore, these multiscale microstructures effectively reduce the κ L over a wide temperature range.…”

Section: Introductionmentioning

confidence: 99%

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Attaining high mid-temperature performance in (Bi,Sb)2Te3 thermoelectric materials via synergistic optimization

Zhu

et al. 2016

NPG Asia Mater

130

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For decades, zone-melted Bi 2 Te 3 -based alloys have been the most widely used thermoelectric materials with an optimal operation regime near room temperature. However, the abundant waste heat in the mid-temperature range poses a challenge; namely, how and to what extent the service temperature of Bi 2 Te 3 -based alloys can be upshifted to the mid-temperature regime. We report herein a synergistic optimization procedure for Indium doping and hot deformation that combines intrinsic point defect engineering, band structure engineering and multiscale microstructuring. Indium doping modulated the intrinsic point defects, broadened the band gap and thus suppressed the detrimental bipolar effect in the mid-temperature regime; in addition, hot deformation treatment rendered a multiscale microstructure favorable for phonon scattering and the donor-like effect helped optimize the carrier concentration. As a result, a peak value of zT of~1.4 was attained at 500 K, with a state-of-the-art average zT av of~1.3 between 400 and 600 K in Bi 0.3 Sb 1.625 In 0.075 Te 3 . These results demonstrate the efficacy of the multiple synergies that can also be applied to optimize other thermoelectric materials. INTRODUCTIONThermoelectricity is the simplest technology for direct heat-toelectricity power generation. Thermoelectric (TE) devices are all solid state, without rotation parts or working fluids, and are thus easy to miniaturize. These modular characteristics make TE devices reliable, durable and easy to use in tandem with other energy conversion technologies. 1,2 The energy conversion efficiency of a TE device is primarily determined by the TE material's dimensionless figure of merit, defined as zT = α 2 σT/κ, where α is the Seebeck coefficient, σ is the electrical conductivity, κ is the total thermal conductivity (including the lattice contribution κ L and the carrier contribution κ e ) and T is the absolute temperature. 2 zT is generally a function of temperature whereas waste heat is the energy source for TE power generation. It is useful to compare the optimal operation temperature ('service temperature') of state-of-the-art TE materials and the temperature range in which most of the waste heat is produced. State-of-the-art TE materials have their best zT values (those between 1 and 2) in different temperature regimes; for example, Bi 2 Te 3 works best near room temperature, 3,4 whereas PbTe, Mg 2 Si 1-x Sn x , Half-Heusler compounds and filled skutterudites generally reach their best performance above 600 K. [5][6][7][8][9][10][11][12][13][14] There is a conspicuous lack of high-performance TE materials between 400 and 600 K, the

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“…This computational finding may even explain the lattice curvature in polycrystalline Bi 0.5 Sb 1.5 Te 3 alloys processed by hot forging. 17 It is apparent from Fig. 4b that the structural disorder of the atoms gradually leads to an increase of the distance between specific adjacent Te1 layers, with formation of weak interfaces.…”

Section: Resultsmentioning

confidence: 90%

Effects of Van der Waals Bonding on the Compressive Mechanical Behavior of Bulk Bi2Te3: A Molecular Dynamics Study

Huang

Yang

Liu

et al. 2014

Journal of Elec Materi

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Along the c axis of the crystal lattice, Bi 2 Te 3 has periodic quintuple layers ''-Te1-Bi-Te2-Bi-Te1-'' which are connected by Van der Waals bonding. The weak bonding between Te1-Te1 layers substantially affects the mechanical properties of Bi 2 Te 3 . In the work discussed in this paper, the molecular dynamics method was used to study the mechanical properties of cuboid single-crystal of bulk Bi 2 Te 3 under compressive loads. The emphasis was on the effects of the Van der Waals bonding on the deformation and failure mechanism. The molecular dynamics simulation results revealed that Van der Waals bonding has a dominant effect on the mechanism of deformation, and fundamentally determines the ultimate stress and fracture strain. Furthermore, the compressive load along the a and c axes lead to quite different failure behavior, which can be distinguished by their specific effects on the deformation of the Van der Waals bonding. However, only models with the load along the a axis dramatically demonstrate the effect of strain rate on the stress-strain curves, in accordance with the poor structural stability.

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Recrystallization induced in situ nanostructures in bulk bismuth antimony tellurides: a simple top down route and improved thermoelectric properties

Cited by 189 publications

References 20 publications

Promising Thermoelectric Bulk Materials with 2D Structures

Promising Thermoelectric Bulk Materials with 2D Structures

Attaining high mid-temperature performance in (Bi,Sb)2Te3 thermoelectric materials via synergistic optimization

Effects of Van der Waals Bonding on the Compressive Mechanical Behavior of Bulk Bi2Te3: A Molecular Dynamics Study

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