期刊
SCIENCE
卷 365, 期 6452, 页码 495-498出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aax7792
关键词
-
资金
- Alexander von Humboldt Foundation
Thermoelectric materials have a large Peltier effect, making them attractive for solid-state cooling applications. Bismuth telluride (Bi2Te3)-based alloys have remained the state-of-the-art room-temperature materials for many decades. However, cost partially limited wider use of thermoelectric cooling devices because of the large amounts of expensive tellurium required. We report n-type magnesium bismuthide (Mg3Bi2)-based materials with a peak figure of merit (ZT) of similar to 0.9 at 350 kelvin, which is comparable to the commercial bismuth telluride selenide (Bi2Te3-xSex) but much cheaper. A cooling device made of our material and p-type bismuth antimony telluride (Bi0.5Sb1.5Te3) has produced a large temperature difference of similar to 91 kelvin at the hot-side temperature of 350 kelvin. n-type Mg3Bi2-based materials are promising for thermoelectric cooling applications.
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