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
Department of Physics, University of Houston, Houston, TX 77204.
Texas Center for Superconductivity at the University of Houston, University of Houston, Houston, TX 77204.
Proc Natl Acad Sci U S A. 2016 Nov 29;113(48):13576-13581. doi: 10.1073/pnas.1617663113. Epub 2016 Nov 15.
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⋅K is achieved by increasing the hot pressing temperature up to 1,373 K in the p-type half-Heusler NbTiFeSb. The high power factor subsequently yields a record output power density of ∼22 W⋅cm based 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.
在过去二十年中，热电材料性能的提升很大程度上基于降低声子热导率。相比之下，提高功率因子的成效较小。在这项工作中，通过将热压温度提高到1373K，在p型半赫斯勒合金NbTiFeSb中实现了约106 μW⋅cm⋅K的峰值功率因子。基于在293K至868K之间运行的单腿器件，该高功率因子随后产生了创纪录的约22 W⋅cm的输出功率密度。如此高的输出功率密度对于大规模发电应用可能是有益的。
