Achieving high power factor and output power density in p-type half-Heuslers Nb1-xTixFeSb

Author:

He Ran,Kraemer Daniel,Mao Jun,Zeng Lingping,Jie Qing,Lan Yucheng,Li Chunhua,Shuai Jing,Kim Hee Seok,Liu Yuan,Broido David,Chu Ching-Wu,Chen Gang,Ren Zhifeng

Abstract

Improvements in thermoelectric material performance over the past two decades have largely been based on decreasing the phonon thermal conductivity. Enhancing the power factor has been less successful in comparison. In this work, a peak power factor of ∼106 μW⋅cm−1⋅K−2is achieved by increasing the hot pressing temperature up to 1,373 K in the p-type half-Heusler Nb0.95Ti0.05FeSb. The high power factor subsequently yields a record output power density of ∼22 W⋅cm−2based on a single-leg device operating at between 293 K and 868 K. Such a high-output power density can be beneficial for large-scale power generation applications.

Funder

U.S. Department of Energy

DOD | Air Force Office of Scientific Research

Publisher

Proceedings of the National Academy of Sciences

Subject

Multidisciplinary

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