Ultrahigh Power Factor in Thermoelectric System Nb0.95M0.05FeSb (M = Hf, Zr, and Ti)

Ren W, Zhu H, Zhu Q, Saparamadu U, He R, Liu Z, Mao J, Wang C, Nielsch K, Wang Z, Ren Z (2018)

Publication Type: Journal article

Publication year: 2018

Journal

Advanced Science Wiley Open Access

Book Volume: 5

Article Number: 1800278

Journal Issue: 7

DOI: 10.1002/advs.201800278

Abstract

Conversion efficiency and output power are crucial parameters for thermoelectric power generation that highly rely on figure of merit ZT and power factor (PF), respectively. Therefore, the synergistic optimization of electrical and thermal properties is imperative instead of optimizing just ZT by thermal conductivity reduction or just PF by electron transport enhancement. Here, it is demonstrated that Nb0.95Hf0.05FeSb has not only ultrahigh PF over ≈100 µW cm−1 K−2 at room temperature but also the highest ZT in a material system Nb0.95M0.05FeSb (M = Hf, Zr, Ti). It is found that Hf dopant is capable to simultaneously supply carriers for mobility optimization and introduce atomic disorder for reducing lattice thermal conductivity. As a result, Nb0.95Hf0.05FeSb distinguishes itself from other outstanding NbFeSb-based materials in both the PF and ZT. Additionally, a large output power density of ≈21.6 W cm−2 is achieved based on a single-leg device under a temperature difference of ≈560 K, showing the realistic prospect of the ultrahigh PF for power generation.

Involved external institutions

University of Electronic Science and Technology of China (UESTC) / 电子科技大学 CN China (CN) University of Houston US United States (USA) (US) Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden DE Germany (DE)

How to cite

APA:

Ren, W., Zhu, H., Zhu, Q., Saparamadu, U., He, R., Liu, Z.,... Ren, Z. (2018). Ultrahigh Power Factor in Thermoelectric System Nb0.95M0.05FeSb (M = Hf, Zr, and Ti). Advanced Science, 5(7). https://doi.org/10.1002/advs.201800278

MLA:

Ren, Wuyang, et al. "Ultrahigh Power Factor in Thermoelectric System Nb0.95M0.05FeSb (M = Hf, Zr, and Ti)." Advanced Science 5.7 (2018).

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