Realizing high figure of merit in heavy-band p-type half-Heusler thermoelectric materials
Zhejiang University · Chinese Academy of Sciences · +1 more institution
Abstract
Solid-state thermoelectric technology offers a promising solution for converting waste heat to useful electrical power. Both high operating temperature and high figure of merit zT are desirable for high-efficiency thermoelectric power generation. Here we report a high zT of ∼1.5 at 1,200 K for the p-type FeNbSb heavy-band half-Heusler alloys. High content of heavier Hf dopant simultaneously optimizes the electrical power factor and suppresses thermal conductivity. Both the enhanced point-defect and electron-phonon scatterings contribute to a significant reduction in the lattice thermal conductivity. An eight couple prototype thermoelectric module exhibits a high conversion efficiency of 6.2% and a high power…
Citation impact
- FWCI
- 34.96
- Percentile
- 100%
- References
- 48
Authors
7Topics & keywords
- Materials science
- Thermoelectric effect
- Figure of merit
- Thermoelectric materials
- Thermal conductivity
- Optoelectronics
- Energy conversion efficiency
- Engineering physics
- Affordable and clean energy