Better thermoelectric properties achieved in n-type composite

Better thermoelectric properties achieved in n-type composite
TEM micrographs for composite specimen fBi2Te2.7Se0.3 with f =0.3vol%. Credit: Bushra Jabar

Recently, a research team from the Institute of Solid State Physics, Hefei Institutes of Physical Science showed a way to achieve high thermoelectric properties in n-type Bi2Te2.7Se0.3 (BTS).

After incorporating nanometer-sized particles of 3-D topological insulator Bi2Se3 in BTS, the researchers found that this was a new alloy which could not only boost remarkably, but also lower lattice significantly.

Thermoelectric devices offer an alternative renewable energy resource to alleviate increasing global energy demands and environmental concerns. Currently, n-type BTS is used in both refrigeration and generation application at/near room temperatures. But the low merit (ZT) for BTS poses a foremost barrier in elevation of energy harvesting applications.

As a result, this BTS-based composite system offered high ZT, a crucial factor in thermoelectric devices.

Thus, researchers require a strategy to improve the power factor in addition to lowering thermal conductivity, and this research offers a new approach to enhance both the power factor and phonon blocking for BTS simultaneously so as to boost its ZT significantly.


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More information: Bushra Jabar et al. Enhanced power factor and thermoelectric performance for n-type Bi2Te2.7Se0.3 based composites incorporated with 3D topological insulator nanoinclusions, Nano Energy (2020). DOI: 10.1016/j.nanoen.2020.105512
Journal information: Nano Energy

Citation: Better thermoelectric properties achieved in n-type composite (2020, October 29) retrieved 22 January 2021 from https://phys.org/news/2020-10-thermoelectric-properties-n-type-composite.html
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