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GeTe Thermoelectrics
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DOI：10.1016/j.joule.2020.03.004.png)
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摘要
En 中文
Although GeTe has been known as thermoelectrics since 1960s, it has attracted intensive renewed attention recently. GeTe undergoes a phase transition froma high- T cubic (c-GeTe) to a low-T rhombohedral structure (r-GeTe) through slightly distorting along the [111] direction at similar to 720 K. Previous thermoelectric studies have mostly focused on high-symmetry c-GeTe. To date, low-symmetry r-GeTe has been revealed to show a thermoelectric figure of merit zT as high as that of c- GeTe, because the symmetry breaking electronically enables a diversified rearrangement of split bands for a high band degeneracy and thermally allows hierarchical bonds and microstructures for a lowlattice thermal conductivity. Thiswork summarizes the advancements in both r- and c-GeTe and the corresponding devicelevel progress, clearly demonstrating GeTe as one of the most efficient thermoelectrics for both mid-temperature (500-800 K) and near-room-temperature applications. In addition, topics that might be of interest and lead to further advancements are outlined.
Keyword:
GERMANIUM ANTIMONY TELLURIDES
ENHANCED MECHANICAL STABILITY
ULTRALOW THERMAL-CONDUCTIVITY
HIGH-PERFORMANCE
BAND-STRUCTURE
PHASE-TRANSITIONS
POWER GENERATION
WASTE HEAT
FIGURE
MERIT
期刊
IF:
35.4
论文数:
2.3K
被引数:
4.5W
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