Work

Origin of efficient thermoelectric performance in half-Heusler FeNb0.8Ti0.2Sb

Year: 2018

Type: article

Abstract: A half-Heusler material FeNb0.8Ti0.2Sb has been identified as a promising thermoelectric material due to its excellent thermoelectric performance at high temperatures. The origin of the efficient thermoelectric performance is investigated through a series of low-temperature (2–400 K) measurements. The high data coherence of the low and high temperatures is observed. An optimal and nearly temperature-independent carrier concentration is identified, which is ideal for the power factor. The obtained single type of hole carrier is also beneficial to the large Seebeck coefficient. The electronic thermal conductivity is found to be comparable to the lattice thermal conductivity and becomes the dominant component above 200 K. These findings again indicate that electron scattering plays a key role in the electrical and thermal transport properties. The dimensionless figure of merit is thus mainly governed by the electronic properties. These effects obtained at low temperatures with the avoidance of possible thermal fluctuations together offer the physical origin for the excellent thermoelectric performance in this material.

Source: Journal of Applied Physics

DOI: 10.1063/1.5030938

Authors: Hong-Jie Pang, Chen-Guang Fu, Hao Yu, Liu-Cheng Chen, Tie-Jun Zhu, Xiao-Jia Chen

Institutions: Center for High Pressure Science and Technology Advanced Research, State Key Laboratory of Silicon Materials, Zhejiang University

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: green

Funder: National Natural Science Foundation of China