Enhanced thermoelectric performance in spark plasma textured bulk <i>n</i>-type BiTe2.7Se0.3 and <i>p-type</i> Bi0.5Sb1.5Te3

Bhame, Shekhar D.; Dhanapal, Pravarthana; Prellier, W.; Noudem, Jacques

doi:10.1063/1.4807771

Cited by 50 publications

(26 citation statements)

References 24 publications

(31 reference statements)

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“…d) F values and f) carrier mobility as a function of HD count. e) F values in this work in comparison with those of other n‐type V 2 VI 3 alloys …”

Section: Resultsmentioning

confidence: 73%

Synergistic Compositional–Mechanical–Thermal Effects Leading to a Record High zT in n‐Type V₂VI₃ Alloys Through Progressive Hot Deformation

Zhang

et al. 2018

Adv Funct Materials

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Here a progressive hot deformation procedure that endows the benchmark n-type V 2 VI 3 thermoelectric materials with short range disorder (multiple defects), long range order (crystallinity), and strong texture (nearly orientation order) is reported. Not only it is rare for these structural features to coexist but also these structural features elicit the synergistic compositionalmechanical-thermal effects, i.e., a profound interplay among the counts, magnitude, and temperature of hot deformation in relation to the as formed point defects, dislocations, textures, strain clusters, and distortions. Using progressively larger die sets and relatively low hot deformation temperature, rich multiscale microstructures concurrently with a high level of texture comparable to that of zone melted ingot are obtained. The strong donor-like effect significantly increases the majority carrier concentration, suppressing the detrimental bipolar effect. In addition, the multiscale microstructures yield an ultralow lattice thermal conductivity ≈0.31 W m −1 K −1 at 405 K. A record zT ≈ 1.3 at 450 K are attained in progressively hot deformed n-type Bi 1.95 Sb 0.05 Te 2.3 Se 0.7 through the synergistic effects. These results not only promise a better pairing between n-type and p-type legs in device fabrication but also bring our understanding of n-type V 2 VI 3 alloys and hot deformation technique to a new level.device material's figure of merit, zT = σS 2 T/κ, where T, σ, S, and κ are the absolute temperature, the electrical conductivity, the Seebeck coefficient, and the total thermal conductivity (including the lattice component κ ph and the charge carrier component κ el ), respectively. Toward higher zT, defect engineering is invoked to (i) improve the power factor PF = σS 2 through tuning band structure, [2,3] texture, [4,5] and grain boundary; [6,7] and (ii) suppress the κ ph through multiscale microstructures. [8,9] While point defects are of vital importance, [10,11] it is the synergy among various kinds of defects in defect engineering that underlies the high zT.The rhombohedral V 2 VI 3 materials are a hotbed of defect engineering, [12] the success of which make them the benchmark TE materials for solid-state cooling [8,13,14] and low/mid temperature waste heat harvesting. [15][16][17][18][19][20][21][22][23][24] In particular, the high performance of n-type V 2 VI 3 alloys is subject to a delicate balance between strong textures and multiscale microstructures, which is a challenge for materials synthesis and processing. Making the task more challenging, the performance-enhancing mechanisms proved effective in p-type V 2 VI 3 alloys turned out to be less so in n-type V 2 VI 3 alloys. Compared to the p-type counterpart, the n-type V 2 VI 3 material tends to be electrically more anisotropic: the electrical conductivity anisotropy of Thermoelectrics

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“…d) F values and f) carrier mobility as a function of HD count. e) F values in this work in comparison with those of other n‐type V 2 VI 3 alloys …”

Section: Resultsmentioning

confidence: 73%

Synergistic Compositional–Mechanical–Thermal Effects Leading to a Record High zT in n‐Type V₂VI₃ Alloys Through Progressive Hot Deformation

Zhang

et al. 2018

Adv Funct Materials

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“…Furthermore, the doping of Cu increases the hole concentration, which effectively suppresses the bipolar effect and shis the intrinsic excitation temperature to higher temperature. It is worth to note that the s values of the Cu-doped samples prepared via a facile hydrothermal method in our work could be comparable to that of Bi-Sb-Te alloys synthesized by conventional sintering methods, 30,39 indicating this facile hydrothermal method is an effective route for developing highperformance (Bi,Sb) 2 Te 3 -based materials.…”

Section: Methodsmentioning

confidence: 76%

Significantly enhanced thermoelectric performance of Cu-doped p-type Bi_0.5Sb_1.5Te₃ by a hydrothermal synthesis method

et al. 2017

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Cu-doped p-type Bi 0.5 Sb 1.5 Te 3 compounds have been prepared by a facile hydrothermal method. X-ray powder diffraction analysis shows that the lattice parameter decreases with the Cu content, indicating that Cu + ions are distributed on the crystal site of Bi/Sb, which is further confirmed by the p-type conducting behavior of the Cu-doped Bi 0.5 Sb 1.5 Te 3 . With the addition of Cu, the hole carrier concentration increases, and meanwhile the lattice thermal conductivity decreases. Furthermore, the greatly raised hole carrier concentration effectively suppresses the bipolar effect, which is beneficial for improving the thermoelectric properties. A dimensionless thermoelectric figure of merit (ZT) value of $1.2 at room temperature is achieved for the sample with 0.6 wt% Cu (nominal composition), and the ZT value increases with the temperature to $1.5 at 150 C. Cu-doped Bi 0.5 Sb 1.5 Te 3 samples exhibit most excellent thermoelectric performance among the presently available (Bi,Sb) 2 Te 3 -based materials, implying great potential as near room temperature thermoelectric materials.

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“…However, for the samples textured by repeated SPS, the grains clearly lengthened along the direction normal to the applied pressure, as depicted in Figures 2b-d, which was caused mainly by a crystalline plasticity slip, grain boundary sliding, grain rotation and dynamic recrystallization. 29 Additionally, the shape of the layered structure was enhanced with increasing texturing temperature. The samples processed at higher temperatures apparently exhibited more similar lamellar structure, which is most apparent in TP 500.…”

Section: Resultsmentioning

confidence: 91%

Thermoelectric performance enhancement in n-type Bi2(TeSe)3 alloys owing to nanoscale inhomogeneity combined with a spark plasma-textured microstructure

Pan

2016

NPG Asia Mater

162

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Bi 2 Te 3 is a good thermoelectric compound that can be adjusted to p-or n-type with corresponding substitutions; however, less progress has been achieved for the property enhancement of n-type Bi 2 (TeSe) 3 compared with p-type (BiSb) 2 Te 3 . Textured n-type Bi 2 (TeSe) 3 with an enhanced thermoelectric performance has been developed in this study by combining texturing with in situ nanostructuring effects. The spark plasma-textured structure boosts the electrical transport properties and the power factors as benefits of the layered microstructure. It also leads to a simultaneous rise in the thermal conductivity along the a-axis. We developed a method to suppress increases in the thermal conductivity by inducing nanostructures, such as highly distorted regions and nanoscopic defect clusters, as well as dislocation loops that can form when texturing occurs at an optimized temperature. In this work, textured n-type Bi 2 (TeSe) 3 materials having enhanced thermoelectric performances within a low temperature range are developed with a maximum dimensionless figure of merit (ZT max ) exceeding 1.1 at 473 K. The present method, which synergetically utilizes the texturing and nanostructuring effects, could also be applied to other thermoelectric compounds having layered structures.

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Enhanced thermoelectric performance in spark plasma textured bulk n-type BiTe2.7Se0.3 and p-type Bi0.5Sb1.5Te3

Cited by 50 publications

References 24 publications

Synergistic Compositional–Mechanical–Thermal Effects Leading to a Record High zT in n‐Type V₂VI₃ Alloys Through Progressive Hot Deformation

Synergistic Compositional–Mechanical–Thermal Effects Leading to a Record High zT in n‐Type V₂VI₃ Alloys Through Progressive Hot Deformation

Significantly enhanced thermoelectric performance of Cu-doped p-type Bi_0.5Sb_1.5Te₃ by a hydrothermal synthesis method

Thermoelectric performance enhancement in n-type Bi2(TeSe)3 alloys owing to nanoscale inhomogeneity combined with a spark plasma-textured microstructure

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Enhanced thermoelectric performance in spark plasma textured bulk n-type BiTe2.7Se0.3 and p-type Bi0.5Sb1.5Te3

Cited by 50 publications

References 24 publications

Synergistic Compositional–Mechanical–Thermal Effects Leading to a Record High zT in n‐Type V2VI3 Alloys Through Progressive Hot Deformation

Synergistic Compositional–Mechanical–Thermal Effects Leading to a Record High zT in n‐Type V2VI3 Alloys Through Progressive Hot Deformation

Significantly enhanced thermoelectric performance of Cu-doped p-type Bi0.5Sb1.5Te3 by a hydrothermal synthesis method

Thermoelectric performance enhancement in n-type Bi2(TeSe)3 alloys owing to nanoscale inhomogeneity combined with a spark plasma-textured microstructure

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Synergistic Compositional–Mechanical–Thermal Effects Leading to a Record High zT in n‐Type V₂VI₃ Alloys Through Progressive Hot Deformation

Synergistic Compositional–Mechanical–Thermal Effects Leading to a Record High zT in n‐Type V₂VI₃ Alloys Through Progressive Hot Deformation

Significantly enhanced thermoelectric performance of Cu-doped p-type Bi_0.5Sb_1.5Te₃ by a hydrothermal synthesis method