Journal ArticleDOI
Thermoelectric Property Studies on Cu-Doped n-type CuxBi2Te2.7Se0.3 Nanocomposites
Weishu Liu,Qinyong Zhang,Yucheng Lan,Shuo Chen,Xiao Yan,Qian Zhang,Hui Wang,Dezhi Wang,Gang Chen,Zhifeng Ren +9 more
TLDR
In this paper, the authors showed that good reproducibility can be achieved by introducing an optimal concentration of 0.01 copper (Cu) per Bi2Te2.7Se0.3 samples without texturing.Abstract:
Combining high energy ball-milling and hot-pressing, significant enhancements of the thermoelectric figure-of-merit (ZT) have been reported for p-type Bi0.4Sb1.6Te3 nanocomposites. However, applying the same technique to n-type Bi2Te2.7Se0.3 showed no improvement on ZT values, due to the anisotropic nature of the thermoelectric properties of n-type Bi2Te2.7Se0.3. Even though texturing was effective in improving peak ZT of Bi2Te2.7Se0.3 from 0.85 to 1.04, reproducibility from batch to batch remains unsatisfactory. Here, we show that good reproducibility can be achieved by introducing an optimal concentration of 0.01 copper (Cu) per Bi2Te2.7Se0.3 to make Cu0.01Bi2Te2.7Se0.3 samples. A peak ZT value of 0.99 was achieved in Cu0.01Bi2Te2.7Se0.3 samples without texturing. With texturing by re-pressing, the peak ZT was increased to 1.06. Aging in air for over 5 months did not deteriorate but further improved the peak ZT to 1.10. The mechanism by which copper improves the reproducibility, enhances the carrier mobility, and reduces the lattice thermal conductivity is also discussed.read more
Citations
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Compromise and Synergy in High-Efficiency Thermoelectric Materials.
TL;DR: Novel concepts and paradigms are described here that have emerged, targeting superior TE materials and higher TE performance, including band convergence, "phonon-glass electron-crystal", multiscale phonon scattering, resonant states, anharmonicity, etc.
Journal ArticleDOI
The panoscopic approach to high performance thermoelectrics
TL;DR: In this paper, the authors summarize the relationships between very large reduction of the lattice thermal conductivity with all-scale hierarchical architecturing, large enhanced Seebeck coefficients with intra-matrix electronic structure engineering, and control of the carrier mobility with matrix/inclusion band alignment.
Journal ArticleDOI
Recent advances in thermoelectric nanocomposites
TL;DR: In this paper, the dimensionless figure of merit (ZT) plays a key role in the conversion efficiency from thermal to electrical energy, which has been used in power supply of aeronautic and astronautic exploring missions, now showing notable advantages to harvest the widely distributed waste heat and convert the abundant solar energy into electricity at lower cost than Si-based photovoltaic technology.
Journal ArticleDOI
BiCuSeO oxyselenides: new promising thermoelectric materials
TL;DR: In this paper, the authors summarized the crystal structures, microstructures, electronic structures and physical/chemical properties of BiCuSeO oxyselenides and discussed the approaches that successfully enhanced the thermoelectric performances of these materials.
Journal ArticleDOI
Recent progress of half-Heusler for moderate temperature thermoelectric applications
Shuo Chen,Zhifeng Ren +1 more
TL;DR: In this paper, the synthesis methods for optimizing individual parameters to enhance the thermoelectric performance in both MNiSn and MCoSb based half-Heuslers are summarized.
References
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Cooling, heating, generating power, and recovering waste heat with thermoelectric systems.
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High-Thermoelectric Performance of Nanostructured Bismuth Antimony Telluride Bulk Alloys
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Journal Article
High Thermoelectric Performance of Nanostructured Bismuth Antimony Telluride Bulk Alloys.
Bed Poudel,Qing Hao,Yi Ma,Austin J. Minnich,Andrew Muto,Yucheng Lan,Bo Yu,Xiao Yan,Dezhi Wang,Daryoosh Vashaee,X.Y. Chen,Dresselhaus,Gang Chen,Zhifeng Ren +13 more
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Bulk nanostructured thermoelectric materials: current research and future prospects
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High-performance nanostructured thermoelectric materials
TL;DR: In this article, a review summarizes the progress that has been made in recent years in developing thermoelectric materials with a high dimensionless figure of merits (ZT) and the related fabrication processes for producing nanostuctured materials.