Статья

High-Thermoelectric Performance of Nanostructured Bismuth Antimony Telluride Bulk Alloys

Bed PoudelDepartment of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USAQing HaoDepartment of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USAYi MaDepartment of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USAYucheng LanDepartment of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USAAustin J. MinnichDepartment of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USABo YuDepartment of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USAXiao YanDepartment of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USADezhi WangDepartment of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USAAndrew MutoDepartment of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USADaryoosh VashaeeDepartment of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USAXiaoyuan ChenDepartment of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USAJun‐Ming LiuDepartment of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USAM. S. DresselhausDepartment of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USAGang ChenDepartment of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USAZhifeng RenDepartment of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA

2008en

ABI

Аннотация

The dimensionless thermoelectric figure of merit (ZT) in bismuth antimony telluride (BiSbTe) bulk alloys has remained around 1 for more than 50 years. We show that a peak ZT of 1.4 at 100 degrees C can be achieved in a p-type nanocrystalline BiSbTe bulk alloy. These nanocrystalline bulk materials were made by hot pressing nanopowders that were ball-milled from crystalline ingots under inert conditions. Electrical transport measurements, coupled with microstructure studies and modeling, show that the ZT improvement is the result of low thermal conductivity caused by the increased phonon scattering by grain boundaries and defects. More importantly, ZT is about 1.2 at room temperature and 0.8 at 250 degrees C, which makes these materials useful for cooling and power generation. Cooling devices that use these materials have produced high-temperature differences of 86 degrees , 106 degrees , and 119 degrees C with hot-side temperatures set at 50 degrees, 100 degrees, and 150 degrees C, respectively. This discovery sets the stage for use of a new nanocomposite approach in developing high-performance low-cost bulk thermoelectric materials.

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Идентификаторы

DOI: 10.1126/science.1156446

Цитирования и источники

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