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
Enhanced thermoelectric performance through crystal field engineering in transition metal–doped GeTe
Jing Shuai,Xiaojian Tan,Q. Guo,Jingtao Xu,Alain Gellé,Régis Gautier,Jean-François Halet,F. Failamani,Jun Jiang,Takao Mori,Takao Mori +10 more
TL;DR: In this paper, the synergetic optimization of electronic and thermal transport properties in rhombohedral GeTe doped with transition metal Ti is reported, where the Seebeck coefficient of Ge1-xTixTe is significantly increased and the corresponding thermal conductivity is decreased.
Journal ArticleDOI
High Thermoelectric Performance in Two-Dimensional Janus Monolayer Material WS-X (X = Se and Te).
TL;DR: It is proposed that the Janus WSTe monolayer could be used as a potential thermoelectric material due to its high thermOElectric performance and first-principles calculations and semiclassical Boltzmann transport theory suggest that theJanus monolayers is a better candidate for excellent thermoeLECTric conversion.
Journal ArticleDOI
Achieving high thermoelectric performance with Pb and Zn codoped polycrystalline SnSe via phase separation and nanostructuring strategies
Jiang Liu,Peng Wang,Meiyu Wang,Rui Xu,Jian Zhang,Jizi Liu,Di Li,Ningning Liang,Youwei Du,G. Chen,Guodong Tang +10 more
TL;DR: In this paper, phase separation and nanostructuring strategies were proposed to achieve extremely low thermal conductivity and high thermoelectric performance in polycrystalline SnSe.
Journal ArticleDOI
Two new phases of monolayer group-IV monochalcogenides and their piezoelectric properties
Ting Hu,Jinming Dong +1 more
TL;DR: Two stable structural phases of the monolayer group-IV monochalcogenides GeS, GeSe, SnS and SnSe have been found using first-principles calculations, and will be called as A-MX and H-MX.
Journal ArticleDOI
Investigation of the Anisotropic Thermoelectric Properties of Oriented Polycrystalline SnSe
TL;DR: In this article, a polycrystalline SnSe was synthesized by a melting-annealing-sintering process and X-ray diffraction reveals the sample possesses pure phase and strong orientation along [h00] direction.
References
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Generalized Gradient Approximation Made Simple
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TL;DR: In this paper, the formal relationship between US Vanderbilt-type pseudopotentials and Blochl's projector augmented wave (PAW) method is derived and the Hamilton operator, the forces, and the stress tensor are derived for this modified PAW functional.
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Special points for brillouin-zone integrations
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.