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Ultrahigh Thermoelectric Performance in Mosaic Crystals
Ying He1,2,3, Ping Lu1,3, Xun Shi1,2
1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.
Advanced Materials (Deerfield Beach, Fla.)
|May 13, 2015
Summary
Researchers achieved a figure of merit (zT) of 2.1 at 1000 K in bulk nanomaterials by utilizing nanoscale mosaicity. This new mechanism surpasses conventional approaches for enhancing thermoelectric performance.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Enhancing the dimensionless figure of merit (zT) is crucial for efficient thermoelectric materials.
- Current strategies for zT enhancement above 2 primarily involve bulk nanomaterials or single crystals.
Purpose of the Study:
- To introduce and investigate a novel physical mechanism of nanoscale mosaicity.
- To explore a new approach for improving thermoelectric performance beyond existing methods.
Main Methods:
- Investigated a new physical mechanism termed nanoscale mosaicity.
- Fabricated and characterized bulk nanomaterials exhibiting this mechanism.
Main Results:
- Achieved a dimensionless figure of merit (zT) of 2.1 at 1000 K in bulk nanomaterials.
- Demonstrated that nanoscale mosaicity offers a new pathway for thermoelectric enhancement.
Conclusions:
- Nanoscale mosaicity represents a significant advancement in thermoelectric material design.
- This mechanism provides a route to high thermoelectric performance in bulk nanomaterials.
Keywords:
electrical conductivitymosaic crystalsthermal conductivitythermoelectric materialsthermopower
