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
Highly Efficient Solar Steam Generation by Glassy Carbon Foam Coated with Two-Dimensional Metal Chalcogenides
Zeeshan Tahir,S.-H. Kim,Farman Ullah,Sunghan Lee,Je-Ho Lee,No-Won Park,Maeng-Je Seong,Sang-Kwon Lee,Tae-Seong Ju,Sungkyun Park,Jong-Seong Bae,Joon I. Jang,Yong Soo Kim +12 more
TL;DR: The BSSG system showed high recyclability, stability and durability under repeated steam-generation cycles, which renders it for practical device applications.
Journal ArticleDOI
Optimization analysis of a segmented thermoelectric generator based on genetic algorithm
TL;DR: In this paper, a one-dimensional numerical model combined with GA is presented for performance analysis and design optimization of the segmented thermoelectric generator (STEG), which is recommended through performance comparison between STEGs with four different structures.
Journal ArticleDOI
Inhomogeneity and anisotropy of chemical bonding and thermoelectric properties of materials
TL;DR: In this article, the authors show that atomic interactions play a key role in the chemical and structural organization of thermoelectric materials as bonding features are the substantial reason for the crystallographic complexity and the physical behavior.
Journal ArticleDOI
Indium substitution effect on thermoelectric and optical properties of Sn1-xInxSe compounds
Jin Hee Kim,Suekyung Oh,Yun Min Kim,Hyeon Seob So,Hosun Lee,Jong-Soo Rhyee,Su Dong Park,Sung Jin Kim +7 more
TL;DR: In this article, the authors investigated the thermoelectric properties of polycrystalline Sn1−x InxSe (x ǫ = 0.0, 0.01,0.05, and 0.1) compounds and the optical properties of single crystalline compounds.
Journal ArticleDOI
A distinct correlation between the vibrational and thermal transport properties of group VA monolayer crystals.
TL;DR: The results corresponding to the studied compound structures clearly point out that thermal (electronic) conductivity of pristine monolayers might be suppressed (improved) by alloying them with the same group elements, and that the thermoelectric potential of these materials can be improved by suppressing their thermal properties.
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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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.