Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 296, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2021.121987
Keywords
Bismuth telluride; Thermoelectric; Wet mechanical alloying; Copper selenide; Hierarchical structures
Funding
- National Natural Science Foundation of China [51802205]
- Fundamental Research Funds for the Central Universities [YJ201789]
- 1000 Talents Program of Sichuan Province
- Australian Research Council
Ask authors/readers for more resources
In this study, the phonon and carrier transport properties of n-type Bi2Te3-based composites were simultaneously optimized through alloying Cu2Se, resulting in enhanced thermoelectric performance. The chemical reactions between Bi2Te3 matrix and Cu2Se additives during sample preparation tuned the carrier concentration and density-of-states effective mass to optimize carrier transport properties, while introducing hierarchical structures reduced lattice thermal conductivity.
To achieve the optimized performance and the widespread application of thermoelectric materials, it is crucial to decouple the highly interrelated thermoelectric parameters of materials. In this study, we illustrate that phonon and carrier transport properties of n-type Bi2Te3-based composites can be simultaneously optimized through alloying Cu2Se. Owing to the chemical reactions between the Bi2Te3 matrix and the Cu2Se additives during the sample preparation, the carrier concentration and density-of-states effective mass can be tuned to optimize the carrier transport properties, while the lattice thermal conductivity can be reduced by introducing hierarchical structures including point defects, Cu7Te5 inclusions, phase boundaries and localized Te-deficient regions. As a result, an enhanced thermoelectric performance is achieved compared with pristine Bi2Te3. Our study indicates the alloying Cu2Se can synergistically control the thermoelectric properties of Bi2Te3.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available