We propose the methodology for thermoelectric power factor enhancement using nanoscale thermal management. The thermally managed composite is composed of a high electrical conductivity (σ) material with high thermal conductivity (κ), and a high Seebeck coefficient (S) material with lowered κ by nanostructuring, where a large temperature difference is applied to high-S materials. This brings out two better properties (high S and high σ) from the two different materials. We experimentally demonstrate that S2σ is enhanced in SiGe-Au composites compared with SiGe materials, where SiGe is used as a high-S material with low κ in Si-based materials and Au is used as a high-σ material with high κ. Therein, the nanostructured Ge-rich domains including Au with Ge nanocrystals form and work as a high-S and ultra-low-κ material. This SiGe-Au composite achieves the highest S2σ value (22 μW cm-1 K-2) among reported SiGe-related bulk materials (Ge fraction: 10-80%) at room temperature. This methodology would be expected as a guideline for thermoelectric performance enhancement.
- power factor
- thermal management
ASJC Scopus subject areas
- Chemical Engineering (miscellaneous)
- Energy Engineering and Power Technology
- Materials Chemistry
- Electrical and Electronic Engineering