Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 13, Issue 7, Pages 2106-2114Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ee01349h
Keywords
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Funding
- Natural Science Foundation of China [11934007, 11874194, 51632005, 51702150]
- Leading Talents of the Guangdong Province Program [00201517]
- Shenzhen DRC project [[2018] 1433]
- Science, Technology and Innovation Commission of the Shenzhen Municipality [KQTD2016022619565991, ZDSYS20141118160434515]
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The application of Bi2Te3-based power generation is seriously hindered by the poor n-type samples, demonstrating a strong demand for high-performance n-type Bi2Te3-based thermoelectric (TE) materials. However, the strong relationship between thermal and electrical transport limits the improvement of the TE properties. Here, we propose a strategy to enhance the Seebeck coefficient while retaining a large electrical conductivity in n-type (Bi,Sb)(2)(Te,Se)(3)materials through introducing electron transport potential wells and texturing. The thermal conductivity was also successfully decreased by constructing multi-scale phonon scattering structures. Consequently, a record maximum and average thermoelectric figure of merit (ZT) of similar to 1.4 and similar to 1.3 were achieved in the Bi1.8Sb0.2Te2.7Se0.3+ 15 wt% Te sample at a temperature of 300-575 K. A TE power generation module was fabricated with this n-type material and a home-made p-type Bi(2)Te(3)sample. It demonstrated a record conversion efficiency of 6.6% at a temperature gradient of 235 K, representing about an 88% improvement compared with a commercial zone-melt Bi2Te3-based module.
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