Journal ArticleDOI
Giant thermoelectric Seebeck coefficient of a two-dimensional electron gas in SrTiO3
Hiromichi Ohta,Hiromichi Ohta,Sung Wng Kim,Yoriko Mune,Teruyasu Mizoguchi,Kenji Nomura,Shingo Ohta,Takashi Nomura,Yuki Nakanishi,Yuichi Ikuhara,Masahiro Hirano,Hideo Hosono,Kunihito Koumoto +12 more
TLDR
The present approach using a 2DEG provides a new route to realize practical thermoelectric materials without the use of toxic heavy elements and enhances the Seebeck coefficient without reducing the electrical conductivity.Abstract:
Enhancement of the Seebeck coefficient (S ) without reducing the electrical conductivity (sigma) is essential to realize practical thermoelectric materials exhibiting a dimensionless figure of merit (ZT=S2 x sigma x T x kappa-1) exceeding 2, where T is the absolute temperature and kappa is the thermal conductivity. Here, we demonstrate that a high-density two-dimensional electron gas (2DEG) confined within a unit cell layer thickness in SrTiO(3) yields unusually large |S|, approximately five times larger than that of SrTiO(3) bulks, while maintaining a high sigma2DEG. In the best case, we observe |S|=850 microV K-1 and sigma2DEG=1.4 x 10(3) S cm-1. In addition, by using the kappa of bulk single-crystal SrTiO(3) at room temperature, we estimate ZT approximately 2.4 for the 2DEG, corresponding to ZT approximately 0.24 for a complete device having the 2DEG as the active region. The present approach using a 2DEG provides a new route to realize practical thermoelectric materials without the use of toxic heavy elements.read more
Citations
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Journal ArticleDOI
Semiconductor nanowires for energy conversion.
Allon I. Hochbaum,Peidong Yang +1 more
TL;DR: It is discovered that the thermoconductivity of the silicon nanowires can be significantly reduced due to phonon scattering, pointing to a very promising approach to design better thermoelectrical materials.
Journal ArticleDOI
Novel Electronic and Magnetic Properties of Two‐Dimensional Transition Metal Carbides and Nitrides
Mohammad Khazaei,Masao Arai,Taizo Sasaki,Chan Yeup Chung,Natarajan Sathiyamoorthy Venkataramanan,Mehdi Estili,Yoshio Sakka,Yoshiyuki Kawazoe +7 more
TL;DR: In this article, the formation and electronic properties of various MXene systems, M 2 C (M = Sc, Ti, V, Cr, Zr, Nb, Ta), M 2 N (M 2 N), with surfaces chemically functionalized by F, OH, and O groups, are examined.
Journal ArticleDOI
Nanostructured Thermoelectrics: Big Efficiency Gains from Small Features
TL;DR: This article sets out to summarize and clarify the current understanding in this field; explain the underpinnings of breakthroughs reported in the past decade; and provide a critical review of various concepts and experimental results related to nanostructured thermoelectrics.
Journal ArticleDOI
Oxide Interfaces—An Opportunity for Electronics
TL;DR: The state of the art of this emerging field of electronics is traced and some of the challenges and pitfalls that may lie ahead are discussed.
Journal ArticleDOI
Advanced Thermoelectric Design: From Materials and Structures to Devices
TL;DR: This review aims to comprehensively summarize the state-of-the-art strategies for the realization of high-performance thermoelectric materials and devices by establishing the links between synthesis, structural characteristics, properties, underlying chemistry and physics.
References
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Journal ArticleDOI
Thin-film thermoelectric devices with high room-temperature figures of merit
TL;DR: Th thin-film thermoelectric materials are reported that demonstrate a significant enhancement in ZT at 300 K, compared to state-of-the-art bulk Bi2Te3 alloys, and the combination of performance, power density and speed achieved in these materials will lead to diverse technological applications.
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Effect of quantum-well structures on the thermoelectric figure of merit.
TL;DR: In this article, the authors proposed to use quantum-well superlattice structures to enhance the performance of thermoelectric coolers and showed that layering has the potential to increase significantly the figure of merit of a highly anisotropic material.
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Thermoelectric Cooling and Power Generation
TL;DR: Improved materials would not only help to cool advanced electronics but could also provide energy benefits in refrigeration and when using waste heat to generate electrical power.
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Cubic AgPbmSbTe2+m: Bulk Thermoelectric Materials with High Figure of Merit
Kuei Fang Hsu,Sim Loo,Fu Guo,Wei Chen,Jeffrey S. Dyck,Ctirad Uher,Timothy P. Hogan,Efstathios K. Polychroniadis,Mercouri G. Kanatzidis +8 more
TL;DR: In the temperature range 600 to 900 kelvin, the AgPbmSbTe2+m material is expected to outperform all reported bulk thermoelectrics, thereby earmarking it as a material system for potential use in efficient thermoeLECTric power generation from heat sources.
Journal ArticleDOI
Large thermoelectric power in NaCo 2 O 4 single crystals
TL;DR: In this article, the authors measured and analyzed the transport properties of a single-crystal transition-metal oxide and found that the resistivity is highly anisotropic between in-and out-of-plane directions.