Tellurium-free thermoelectrics: Improved thermoelectric performance of n-type Bi 2 Se 3 having multiscale hierarchical architecture

Bohra, Anil; Bhatt, Ranu; Singh, Ajay; Basu, Ranita; Bhattacharya, Shovit; Meshram, K.N.; Ahmad, Sajid; Debnath, A.K.; Chauhan, Avnee; Bhatt, Pramod; Shah, Kunjal; Bhotkar, Ketan; Sharma, Saloni; Aswal, D. K.; Muthe, K. P.; Gadkari, S. C.

doi:10.1016/j.enconman.2017.04.083

Cited by 41 publications

(20 citation statements)

References 39 publications

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“…In this work, we found an optimized the HD temperature at 723 K, which balanced the plastic deformation and dynamic recrystallization. As a result, the derived F value is higher than those of n‐type V 2 VI 3 polycrystalline alloys, and is close to that of Bi 2 Te 3 thin film and single crystal (Figure e).…”

Section: Resultssupporting

confidence: 59%

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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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Section: Resultssupporting

confidence: 59%

“…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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“…The result is depicted in Figure 3 showing two typical Raman active modes 𝐸 E $ , and 𝐴 0E $ obtained at wavenumbers of 134 cm -1 and 176 cm -1 respectively for the pristine sample (Bi2Se3). The peak found at 256 cm -1 is linked to the interchain bond strength vibrational mode of the disordered Se chains 16 . Here, the "A" and "E" denote the out-of-plane and in-plane lattice vibration (Figure 3b) respectively, and the subscript "g" represents the Raman active mode.…”

Section: Resultsmentioning

confidence: 98%

Effective decoupling of seebeck coefficient and the electrical conductivity through isovalent substitution of erbium in bismuth selenide thermoelectric material

Musah

Ilyas

Novitskii

et al. 2021

Journal of Alloys and Compounds

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Recognizing high thermoelectric performance in semiconducting materials is a challenging task. This is because the Seebeck coefficient and electrical conductivity which constitute the thermoelectric power factor are unfavourably coupled. This means decoupling the transport properties of thermoelectric materials to enhance the power factor without compromising the thermal conductivity is essential. Herein we report that the substitution of erbium (Er) within bismuth selenide (Bi2Se3) results in a simultaneous enhancement in Seebeck coefficient and electrical conductivity via effective mass and Fermi energy optimization. The Er-Substitution in Bi2Se3 does not only promote a simultaneous increase in Seebeck coefficient and electrical conductivity but also decreases the thermal conductivity through an enhancement in phonon scattering.Consequently, the optimum composition is found for the Bi1.85Er0.15Se3 sample instigating that, minimal substitution amount is required to optimize the thermoelectric performance. Our numerical calculation also shows that Er substitution alters the Fermi energy of the Bi2Se3 TE materials, thereby enhancing the effective mass. Through Raman and XPS characterization, we also elucidate that Er substitution does not change the chemical structure and chemical bonding of the pristine material appreciably. It thus leads to improvement in the Seebeck coefficient and electrical conductivity via effective mass optimization. This unique work presents a facile, scalable, cost-effective, and controllable synthesis of nanostructured Bi2Se3 toward realizing high-performance thermoelectric devices.

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“…by Se substitution and Cu doping. 9 In addition to its thermoelectric properties, 10,11 angle-resolved photoemission spectroscopy (ARPES) has proved that Bi 2 Se 3 and Bi 2 Te 3 are topological insulators. 3,[12][13][14] Variants of Bi 2 Te 3 or Bi 2 Se 3 doped with transition metals such as Cr or Fe exhibit different magnetic interactions caused by the dopants; they may represent a new class of magnetic topological insulators in the field of spintronics.…”

Section: Introductionmentioning

confidence: 99%

Layered manganese bismuth tellurides with GeBi₄Te₇- and GeBi₆Te₁₀-type structures: towards multifunctional materials

et al. 2019

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Tellurium-free thermoelectrics: Improved thermoelectric performance of n-type Bi 2 Se 3 having multiscale hierarchical architecture

Cited by 41 publications

References 39 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

Effective decoupling of seebeck coefficient and the electrical conductivity through isovalent substitution of erbium in bismuth selenide thermoelectric material

Layered manganese bismuth tellurides with GeBi₄Te₇- and GeBi₆Te₁₀-type structures: towards multifunctional materials

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Tellurium-free thermoelectrics: Improved thermoelectric performance of n-type Bi 2 Se 3 having multiscale hierarchical architecture

Cited by 41 publications

References 39 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

Effective decoupling of seebeck coefficient and the electrical conductivity through isovalent substitution of erbium in bismuth selenide thermoelectric material

Layered manganese bismuth tellurides with GeBi4Te7- and GeBi6Te10-type structures: towards multifunctional materials

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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

Layered manganese bismuth tellurides with GeBi₄Te₇- and GeBi₆Te₁₀-type structures: towards multifunctional materials