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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Extraordinary role of Zn in enhancing thermoelectric performance of Ga-doped n-type PbTe
Zhong Luo,Songting Cai,Shiqiang Hao,Trevor P. Bailey,Yubo Luo,Wenjun Luo,Yan Yu,Ctirad Uher,Chris Wolverton,Vinayak P. Dravid,Zhigang Zou,Qingyu Yan,Mercouri G. Kanatzidis +12 more
TL;DR: Although Ga doping can weaken the electron phonon coupling of n-type PbTe, Ga-doped pbTe has a relatively low carrier concentration (n) and high lattice thermal conductivity (κlat), resulting in a... as discussed by the authors .
Journal ArticleDOI
Chlorine-Enabled Electron Doping in Solution-Synthesized SnSe Thermoelectric Nanomaterials
Guang Han,S. R. Popuri,Heather F. Greer,Lourdes Ferre Llin,Jan-Willem G. Bos,Wuzong Zhou,Douglas J. Paul,Hervé Ménard,Andrew Ramsay Knox,Andrea Montecucco,Jonathan Siviter,Elena A. Man,Wenguang Li,Manosh C. Paul,Min Gao,Tracy K. N. Sweet,Robert Freer,Feridoon Azough,Hasan Baig,Tapas K. Mallick,Duncan H. Gregory +20 more
TL;DR: In this paper, an aqueous solution method is developed for the facile synthesis of Cl-containing SnSe nanoparticles in 10 g quantities per batch, which can be efficiently tuned as a function of reaction duration.
Journal ArticleDOI
Synthesis, characterisation and thermoelectric properties of the oxytelluride Bi2O2Te
TL;DR: In this paper, the electrical and thermal transport properties of Bi 2 O 2 Te were investigated as a function of temperature over the temperature range 300≤ T (K)≤665.
Journal ArticleDOI
Magnetocaloric properties and critical behavior of high relative cooling power FeNiB nanoparticles
Varun Chaudhary,D. V. Maheswar Repaka,Apoorva Chaturvedi,Idapalapati Sridhar,Raju V. Ramanujan +4 more
TL;DR: In this paper, the authors reported a very high relative cooling power (RCP) in quenched FeNiB nanoparticles, which is the largest for rare earth free iron based magnetocaloric nanomaterials.
Journal ArticleDOI
Two-step fabrication of single-layer rectangular SnSe flakes
Jizhou Jiang,Jizhou Jiang,Calvin Pei Yu Wong,Calvin Pei Yu Wong,Jing Zou,Shisheng Li,Qixing Wang,J. C. Chen,Dianyu Qi,Dianyu Qi,Hongyu Wang,Goki Eda,Daniel H. C. Chua,Yumeng Shi,Wenjing Zhang,Andrew T. S. Wee +15 more
TL;DR: In this paper, a two-step synthesis method was used to synthesize large-scale single-layer rectangular SnSe flakes with a thickness of 6.8 A and lateral dimensions of about 30 µm × 50 µm.
References
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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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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.