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Science. 2019 Aug 2;365(6452):495-498. doi: 10.1126/science.aax7792. Epub 2019 Jul 18.

High thermoelectric cooling performance of n-type Mg3Bi2-based materials.

Author information

1
Department of Physics and Texas Center for Superconductivity (TcSUH), University of Houston, Houston, TX 77204, USA.
2
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
3
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. gchen2@mit.edu zren@uh.edu.
4
Department of Physics and Texas Center for Superconductivity (TcSUH), University of Houston, Houston, TX 77204, USA. gchen2@mit.edu zren@uh.edu.

Abstract

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 ~0.9 at 350 kelvin, which is comparable to the commercial bismuth telluride selenide (Bi2Te3- x Se x ) 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 ~91 kelvin at the hot-side temperature of 350 kelvin. n-type Mg3Bi2-based materials are promising for thermoelectric cooling applications.

PMID:
31320557
DOI:
10.1126/science.aax7792

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