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
High-Performance PbTe Thermoelectric Films by Scalable and Low-Cost Printing
TL;DR: In this article, a scalable, low-cost screen printing method was proposed to make PbTe-SrTe-based thermoelectric films via a scalable and low cost screen-printing method.
Journal ArticleDOI
Solution-processable flexible thermoelectric composite films based on conductive polymer/SnSe0.8S0.2 nanosheets/carbon nanotubes for wearable electronic applications
Hyun Ju,Dabin Park,Jooheon Kim +2 more
TL;DR: In this paper, a flexible thermoelectric composite films consisting of conductive polyaniline (PANI)-coated SnSe0.8S0.2 nanosheets (NSs) and polyvinylidene fluoride (PVDF) are fabricated via a solution processing procedure.
Journal ArticleDOI
Ag-doped SnSe2 as a promising mid-temperature thermoelectric material
Fu Li,Fu Li,Zhuanghao Zheng,Yiwen Li,Wenting Wang,Jing-Feng Li,Bo Li,Aihua Zhong,Jingting Luo,Ping Fan +9 more
TL;DR: In this article, the authors investigated the thermoelectric property of a layered metal dichalcogenide SnSe2, which is also non-toxic and earth abundant, especially with a similar composition of SnSe.
Journal ArticleDOI
Angle-resolved photoemission spectroscopy for the study of two-dimensional materials
TL;DR: In this article, Angle-resolved photoemission spectroscopy (ARPES) is used to investigate the underlying changes of band structure to provide essential information for understanding and controlling such properties.
Journal ArticleDOI
Morphology–Function Relationship of Thermoelectric Nanocomposite Films from PEDOT:PSS with Silicon Nanoparticles
Nitin Saxena,Nitin Saxena,Mihael Coric,Anton Greppmair,Jan Wernecke,Mika Pflüger,Michael Krumrey,Martin S. Brandt,Eva M. Herzig,Eva M. Herzig,Peter Müller-Buschbaum,Peter Müller-Buschbaum +11 more
TL;DR: In this paper, the relation of the thermoelectric figure of merit and the nanocomposite morphology is studied for thin films consisting of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) with different amounts of silicon nanoparticles (Si-NPs).
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.