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Better Thermoelectric Properties Achieved in n-type Composite

Oct 28, 2020

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 3D topological insulator Bi2Se3 in BTS, the researchers found that this was a new alloy which could not only boost power factor remarkably, but also lower lattice thermal conductivity 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 power 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 better result of high ZT, which was a crucial factor in thermoelectric devices. 

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

 

Fig. TEM micrographs for composite specimen fBi2Se3/Bi2Te2.7Se0.3 with f =0.3vol%. (Image by Bushra Jabar) 

Enhanced power factor and thermoelectric performance for n-type Bi2Te2.7Se0.3 based composites incorporated with 3D topological insulator nanoinclusions

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