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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

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Efficient interlayer charge release for high-performance layered thermoelectrics.

Hao Zhu¹, Zhou Li¹, Chenxi Zhao¹

¹Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.

National Science Review

|October 25, 2021

Summary

Efficiently releasing charges in BiCuSeO superlattices via dual vacancies and Pb codoping enhances carrier concentration and electrical conductivity. This strategy boosts thermoelectric performance, achieving a high ZT value for advanced materials.

Keywords:

carrier concentration interlayer charge release layered superlattice material thermoelectric performance

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Area of Science:

Materials Science
Solid-State Physics
Thermoelectrics

Background:

Layered superlattices offer high Seebeck coefficients and low thermal conductivity.
Poor electrical conductivity due to charge transport barriers hinders thermoelectric performance.

Purpose of the Study:

To enhance thermoelectric performance in BiCuSeO superlattices.
To overcome charge transport limitations through efficient interlayer charge release.

Main Methods:

Utilizing Bi/Cu dual vacancies and Pb codoping in BiCuSeO.
Investigating charge release mechanisms from [Bi2O2]2+ to [Cu2Se2]2- sublayers.
Analyzing carrier concentration, electrical conductivity, and Seebeck coefficient.

Main Results:

Efficient interlayer charge release was achieved via dual vacancies and Pb codoping.
Carrier concentration and electrical conductivity significantly increased.
Multiple Fermi pockets and converged valence bands were activated, enhancing the Seebeck coefficient and power factor.
A high ZT value of ~1.4 was obtained at 823 K.

Conclusions:

Bi/Cu dual vacancies and Pb codoping effectively release interlayer charges in BiCuSeO.
This approach enhances carrier concentration and electrical conductivity, leading to improved thermoelectric properties.
The findings offer insights into designing high-performance thermoelectric materials.