Synergistically improving thermoelectric and mechanical properties of Ge0.94Bi0.06Te through dispersing nano-SiC

Jin, Yang; Zhang, Xiaoxuan; Xiao, Yu; He, Wei; Wang, Dongyang; Li, Juan; Zheng, Shuqi; Ren, Dudi; Qiu, Yuting; Zhao, Li‐Dong

doi:10.1016/j.scriptamat.2020.03.018

Cited by 30 publications

(16 citation statements)

References 42 publications

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“…1d . 28 , 29 , 32 – 39 We found that the group with QG has a more desirable peak ZT and ZT average (323–723 K) compared to those without QG. Our study here further improves the peak ZT to 2.6 at 673 K and ZT average to 1.6 (323–723 K).…”

Section: Introductionmentioning

confidence: 72%

Tunable quantum gaps to decouple carrier and phonon transport leading to high-performance thermoelectrics

Wang

et al. 2022

Nat Commun

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Thermoelectrics enable direct heat-to-electricity transformation, but their performance has so far been restricted by the closely coupled carrier and phonon transport. Here, we demonstrate that the quantum gaps, a class of planar defects characterized by nano-sized potential wells, can decouple carrier and phonon transport by selectively scattering phonons while allowing carriers to pass effectively. We choose the van der Waals gap in GeTe-based materials as a representative example of the quantum gap to illustrate the decoupling mechanism. The nano-sized potential well of the quantum gap in GeTe-based materials is directly visualized by in situ electron holography. Moreover, a more diffused distribution of quantum gaps results in further reduction of lattice thermal conductivity, which leads to a peak ZT of 2.6 at 673 K and an average ZT of 1.6 (323–723 K) in a GeTe system. The quantum gap can also be engineered into other thermoelectrics, which provides a general method for boosting their thermoelectric performance.

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Section: Introductionmentioning

confidence: 72%

Tunable quantum gaps to decouple carrier and phonon transport leading to high-performance thermoelectrics

Wang

et al. 2022

Nat Commun

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“…The grain size in our samples is much smaller than that of other advanced GeTe-based TE materials from former reports, which is conducive to enhancing the phonon scattering for the suppression of the lattice thermal conductivity via the increased grain boundaries. 8,43…”

Section: Resultsmentioning

confidence: 99%

“…Such small grains lead to increased grain boundaries, therefore resulting in lowered lattice thermal conductivity. Generally the GeTe based materials prepared by the mechanical alloying method 8,43 exhibit lower thermal conductivity compared with those prepared by other methods such as vacuum melting. 11,16,51,53,54…”

Section: Resultsmentioning

confidence: 99%

Regulation of Ge vacancies through Sm doping resulting in superior thermoelectric performance in GeTe

et al. 2022

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“…Table summarizes the mechanical properties of state-of-the-art bulk thermoelectric materials with their fabrication methods and peak ZT values for reference (see refs , , , , , , , , − , and − ) As can be seen, the skutterudites and silicides such as Mg 2 Si, SiGe, and HMS possess the highest mechanical properties among all thermoelectric candidates.…”

Section: Dimensional Designmentioning

confidence: 99%

Advanced Thermoelectric Design: From Materials and Structures to Devices

2020

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The long-standing popularity of thermoelectric materials has contributed to the creation of various thermoelectric devices and stimulated the development of strategies to improve their thermoelectric performance. In this review, we aim to comprehensively summarize the state-of-the-art strategies for the realization of high-performance thermoelectric materials and devices by establishing the links between synthesis, structural characteristics, properties, underlying chemistry and physics, including structural design (point defects, dislocations, interfaces, inclusions, and pores), multidimensional design (quantum dots/wires, nanoparticles, nanowires, nano-or microbelts, few-layered nanosheets, nano-or microplates, thin films, single crystals, and polycrystalline bulks), and advanced device design (thermoelectric modules, miniature generators and coolers, and flexible thermoelectric generators). The outline of each strategy starts with a concise presentation of their fundamentals and carefully selected examples. In the end, we point out the controversies, challenges, and outlooks toward the future development of thermoelectric materials and devices. Overall, this review will serve to help materials scientists, chemists, and physicists, particularly students and young researchers, in selecting suitable strategies for the improvement of thermoelectrics and potentially other relevant energy conversion technologies.

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Synergistically improving thermoelectric and mechanical properties of Ge0.94Bi0.06Te through dispersing nano-SiC

Cited by 30 publications

References 42 publications

Tunable quantum gaps to decouple carrier and phonon transport leading to high-performance thermoelectrics

Tunable quantum gaps to decouple carrier and phonon transport leading to high-performance thermoelectrics

Regulation of Ge vacancies through Sm doping resulting in superior thermoelectric performance in GeTe

Advanced Thermoelectric Design: From Materials and Structures to Devices

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