Journal
ADVANCED ENERGY MATERIALS
Volume 10, Issue 41, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202000757
Keywords
amorphous boron; Bi-0; 5Sb(1); 5Te(3); composites; high ZT; thermoelectric materials
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Funding
- Australian Research Council (ARC) through an ARC Professorial Future Fellowship project [FT130100778]
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies (FLEET) [CE170100039]
- Australian Research Council (ARC) through Linkage Infrastructure Equipment and Facilities (LIEF) Grant [LE120100069]
- Australian Research Council (ARC)-Linkage, Infrastructure, Equipment, and Facilities (LIEF) grant [LE120100104]
- China Scholarship Council
- basic science center project of NSFC [51788104]
- Australian Research Council [LE120100069] Funding Source: Australian Research Council
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Based on the Seebeck and Peltier effects, state-of-the-art bismuth telluride-based thermoelectric materials, which are capable of direct and reversible conversion of thermal to electrical energy, have great potential in energy harvesting and solid-state refrigerators. However, their widespread use is limited by their low conversion efficiency, which is determined by the dimensionless figure-of-merit (ZT). Significant enhancement of ZT is a great challenge owing to the common interdependence of electrical and thermal conductivity. Here, it is demonstrated that by incorporating nanoamorphous boron into the p-type Bi0.5Sb1.5Te3, a record high ZT of 1.6 at 375 K is achieved. It is shown that a high density of nanostructures and dislocations due to the incorporation of the boron inclusions, leads to a significant reduction of thermal conductivity and improved charge transport. The findings represent an important step to further promote the development of thermoelectric technology and its widespread application in solid-state refrigeration and power generation from waste heat.
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