Journal ArticleDOI
Ultralow thermal conductivity and high thermoelectric figure of merit in SnSe crystals
Li-Dong Zhao,Shih Han Lo,Yongsheng Zhang,Hui Sun,Gangjian Tan,Ctirad Uher,Chris Wolverton,Vinayak P. Dravid,Mercouri G. Kanatzidis +8 more
TLDR
An unprecedented ZT of 2.6 ± 0.3 at 923 K is reported in SnSe single crystals measured along the b axis of the room-temperature orthorhombic unit cell, which highlights alternative strategies to nanostructuring for achieving high thermoelectric performance.Abstract:
The thermoelectric effect enables direct and reversible conversion between thermal and electrical energy, and provides a viable route for power generation from waste heat The efficiency of thermoelectric materials is dictated by the dimensionless figure of merit, ZT (where Z is the figure of merit and T is absolute temperature), which governs the Carnot efficiency for heat conversion Enhancements above the generally high threshold value of 25 have important implications for commercial deployment, especially for compounds free of Pb and Te Here we report an unprecedented ZT of 26 ± 03 at 923 K, realized in SnSe single crystals measured along the b axis of the room-temperature orthorhombic unit cell This material also shows a high ZT of 23 ± 03 along the c axis but a significantly reduced ZT of 08 ± 02 along the a axis We attribute the remarkably high ZT along the b axis to the intrinsically ultralow lattice thermal conductivity in SnSe The layered structure of SnSe derives from a distorted rock-salt structure, and features anomalously high Gruneisen parameters, which reflect the anharmonic and anisotropic bonding We attribute the exceptionally low lattice thermal conductivity (023 ± 003 W m(-1) K(-1) at 973 K) in SnSe to the anharmonicity These findings highlight alternative strategies to nanostructuring for achieving high thermoelectric performanceread more
Citations
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Journal ArticleDOI
Extremely Low Thermal Conductivity in Thermoelectric Ge0.55Pb0.45Te Solid Solutions via Se Substitution
Junqin Li,Haijun Wu,Haijun Wu,Di Wu,Caiyan Wang,Zhiping Zhang,Yu Li,Fusheng Liu,Weiqin Ao,Jiaqing He +9 more
TL;DR: In this paper, an extremely low lattice thermal conductivity was achieved in a Ge0.55Pb0.45Te-based thermoelectric system through gradually replacing Te by Se.
Journal ArticleDOI
Achieving high room-temperature thermoelectric performance in cubic AgCuTe
Jiang Jing,Jiang Jing,Hangtian Zhu,Niu Yi,Qing Zhu,Shaowei Song,Ting Zhou,Ting Zhou,Chao Wang,Zhifeng Ren +9 more
TL;DR: In this article, the authors reported the enhanced near-room-temperature performance (ZTmax = ∼1.1 at 350 K, ZTavg = ∼ 1.0 between 300 K and 673 K) of copper chalcogenide (AgCu)0.995Te0.9Se0.1 by successfully stabilizing the face-centered cubic (FCC) phase at room temperature.
Journal ArticleDOI
High Thermoelectric Performance in n-Type Polycrystalline SnSe via Dual Incorporation of Cl and PbSe and Dense Nanostructures.
TL;DR: PbSe alloying enhances the power factor and suppresses lattice thermal conductivity at the same time, giving a highest thermoelectric figure of merit ZT of 1.2 at 823 K for n-type polycrystalline SnSe materials.
Journal ArticleDOI
Sensitivity Enhancement of a Surface Plasmon Resonance with Tin Selenide (SnSe) Allotropes.
TL;DR: The simulated results have indicated that the proposed SnSe-containing biochemical sensors are suitable to detect different types of analytes, and suggest that these 2D materials can adjust SPR sensor properties.
Journal ArticleDOI
Low-Temperature Structure and Thermoelectric Properties of Pristine Synthetic Tetrahedrite Cu12Sb4S13
Daria I. Nasonova,Valeriy Yu. Verchenko,Valeriy Yu. Verchenko,Alexander A. Tsirlin,Andrei V. Shevelkov +4 more
TL;DR: In this paper, the authors examined the low-temperature crystal structure and thermoelectric properties of unsubstituted synthetic tetrahedrite, Cu12Sb4S13.
References
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Generalized Gradient Approximation Made Simple
TL;DR: A simple derivation of a simple GGA is presented, in which all parameters (other than those in LSD) are fundamental constants, and only general features of the detailed construction underlying the Perdew-Wang 1991 (PW91) GGA are invoked.
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Hendrik J. Monkhorst,J.D. Pack +1 more
TL;DR: In this article, a method for generating sets of special points in the Brillouin zone which provides an efficient means of integrating periodic functions of the wave vector is given, where the integration can be over the entire zone or over specified portions thereof.
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Complex thermoelectric materials.
TL;DR: A new era of complex thermoelectric materials is approaching because of modern synthesis and characterization techniques, particularly for nanoscale materials, and the strategies used to improve the thermopower and reduce the thermal conductivity are reviewed.
Journal ArticleDOI
High-performance bulk thermoelectrics with all-scale hierarchical architectures
Kanishka Biswas,Jiaqing He,Ivan Blum,Ivan Blum,Chun I. Wu,Timothy P. Hogan,Timothy P. Hogan,David N. Seidman,Vinayak P. Dravid,Mercouri G. Kanatzidis,Mercouri G. Kanatzidis +10 more
TL;DR: It is shown that heat-carrying phonons with long mean free paths can be scattered by controlling and fine-tuning the mesoscale architecture of nanostructured thermoelectric materials, and an increase in ZT beyond the threshold of 2 highlights the role of, and need for, multiscale hierarchical architecture in controlling phonon scattering in bulk thermoeLECTrics.