Prototype fabrication and performance evaluation of a thermoelectric module operating with the Nernst effect

Murata, Masayuki; Nagase, Kazuo; Aoyama, Kayo; Yamamoto, Atsushi; Sakuraba, Yuya

doi:10.1016/j.isci.2020.101967

Cited by 14 publications

(11 citation statements)

References 30 publications

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“…Mainly limited by its high κ xx , our polycrystalline NbP 1+x is not suitable for power generation under temperature gradient, which, however, adapts for transverse thermoelectric cooling due to its outstanding PF xy near room temperature. [24,33]…”

Section: Discussionmentioning

confidence: 99%

“…These intrinsic transport features of Weyl semimetals are intimately related to the unique Weyl semimetal states with linearly dispersed bands around Weyl points in the momentum space. [6,8,10,15,[25][26][27] Therefore, TaAs-class Weyl semimetals possess great potential for practical applications in magneto-electric sensors [28][29][30][31][32] and transverse thermoelectric conversion, [33][34][35][36] owing to their remarkable MR effect and Nernst effect.…”

Section: Introductionmentioning

confidence: 99%

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Weyl Semimetal States Generated Extraordinary Quasi‐Linear Magnetoresistance and Nernst Thermoelectric Power Factor in Polycrystalline NbP

Liu

Wang

et al. 2022

Adv Funct Materials

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Unsaturated and extremely large magnetoresistance (MR), as well as the giant Nernst effect, are intriguing transport phenomena in Weyl semimetals, which are technically appealing for potential applications in magneto-electric sensors and transverse thermoelectric conversion. The prominent properties are originated from Weyl semimetal states, i.e., the coexistence of electron and hole pockets combined with linear band dispersion. However, previous studies have been focused on small-sized single crystals, rendering the practical applications of Weyl semimetals. Here, it is reported an unsaturated, quasi-linear MR as well as a very large Nernst power factor PF xy in the prepared centimeter-sized and polycrystalline Weyl semimetal NbP. An extraordinary MR of ≈2 × 10 4 % is observed below 60 K with a magnetic field up to 55 T and persists to elevated temperatures. The unusual quasi-linear MR behavior is explained by the theory of classical linear MR arising from structural disorder. The polycrystalline NbP exhibits state-of-the-art PF xy that reaches a maximum value of 74.81 μW cm -1 K -2 at 9 T and 220 K, which is 1.5 times larger than its longitudinal thermoelectric power factor PF xx . Given that polycrystalline Weyl semimetal, NbP is suitable for large-scale production, the results pave the way for its practical applications in magneto-electric sensors and transverse thermoelectric conversion.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Weyl Semimetal States Generated Extraordinary Quasi‐Linear Magnetoresistance and Nernst Thermoelectric Power Factor in Polycrystalline NbP

Liu

Wang

et al. 2022

Adv Funct Materials

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“…Although ONE in semiconductors and semimetals exhibit a substantially large transverse thermopower, it has not been applied in practice because its operation requires large magnetic fields. [5][6][7][8] In contrast, in magnetic materials with spontaneous magnetization, the Nernst effect appears even in the absence of magnetic fields owing to the spin-orbit interaction, which is called the anomalous Nernst effect (ANE) [Fig. 1(c)].…”

mentioning

confidence: 99%

Transverse thermoelectric generation using magnetic materials

Uchida

Zhou

Sakuraba

2021

Applied Physics Letters

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The transverse thermoelectric effect refers to the conversion of a temperature gradient into a transverse charge current, or vice versa, which appears in a conductor under a magnetic field or in a magnetic material with spontaneous magnetization. Among such phenomena, the anomalous Nernst effect in magnetic materials has been receiving increased attention from the viewpoints of fundamental physics and thermoelectric applications owing to the rapid development of spin caloritronics and topological materials science. In this research trend, a conceptually different transverse thermoelectric conversion phenomenon appearing in thermoelectric/magnetic hybrid materials has been demonstrated, enabling the generation of a large transverse thermopower. Here, we review the recent progress in fundamental and applied studies on the transverse thermoelectric generation using magnetic materials.

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“…|Vout| linearly decreases with increasing |Iload|, and Pout exhibits the parabolic |Iload| dependence, in a similar manner to the behaviors of transverse thermoelectric modules. 25 The maximum extractable electrical power of ~5.3 nW was obtained at |Iload| = 0.27 mA for the CMG/Si hybrid bulk material, while that of ~0.7 nW was obtained at 0.10 mA for the plain CMG slab with the same thickness in the absence of the electrical connection to Si.…”

Section: (E)mentioning

confidence: 93%

Seebeck-driven transverse thermoelectric generation in magnetic hybrid bulk materials

Zhou

Miura

Hirai

et al. 2023

Applied Physics Letters

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Seebeck-driven transverse thermoelectric generation in magnetic/thermoelectric hybrid materials (STTG) has been investigated in all-bulk hybrid materials. Transverse thermopower in a ferromagnetic Co2MnGa/thermoelectric n-type Si hybrid bulk material with adjusted dimensions reaches 16.0 μV/K at room temperature with the aid of the STTG contribution, which is much larger than the anomalous Nernst coefficient of the Co2MnGa slab (6.8 μV/K). Although this transverse thermopower is smaller than the value for previously reported thin-film-based hybrid materials, hybrid bulk materials exhibit much larger electrical power owing to their small internal resistance. This demonstration confirms the validity of STTG in bulk materials and clarifies its potential as a thermal energy harvester.

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Prototype fabrication and performance evaluation of a thermoelectric module operating with the Nernst effect

Abstract: Thermoelectric module operating with the Nernst effect is developed as a prototypePower density of 86.7 mW/ cm 2 is obtained with a temperature difference of 149 K Temperature difference of 82 mK occurs as a cooling operation

Cited by 14 publications

References 30 publications

Weyl Semimetal States Generated Extraordinary Quasi‐Linear Magnetoresistance and Nernst Thermoelectric Power Factor in Polycrystalline NbP

Weyl Semimetal States Generated Extraordinary Quasi‐Linear Magnetoresistance and Nernst Thermoelectric Power Factor in Polycrystalline NbP

Transverse thermoelectric generation using magnetic materials

Seebeck-driven transverse thermoelectric generation in magnetic hybrid bulk materials

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