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- Title
Carrier-phonon decoupling in perovskite thermoelectrics via entropy engineering.
- Authors
Zheng, Yunpeng; Zhang, Qinghua; Shi, Caijuan; Zhou, Zhifang; Lu, Yang; Han, Jian; Chen, Hetian; Ma, Yunpeng; Zhang, Yujun; Lin, Changpeng; Xu, Wei; Ma, Weigang; Li, Qian; Yang, Yueyang; Wei, Bin; Yang, Bingbing; Zou, Mingchu; Zhang, Wenyu; Liu, Chang; Dou, Lvye
- Abstract
Thermoelectrics converting heat and electricity directly attract broad attentions. To enhance the thermoelectric figure of merit, zT, one of the key points is to decouple the carrier-phonon transport. Here, we propose an entropy engineering strategy to realize the carrier-phonon decoupling in the typical SrTiO3-based perovskite thermoelectrics. By high-entropy design, the lattice thermal conductivity could be reduced nearly to the amorphous limit, 1.25 W m−1 K−1. Simultaneously, entropy engineering can tune the Ti displacement, improving the weighted mobility to 65 cm2 V−1 s−1. Such carrier-phonon decoupling behaviors enable the greatly enhanced μW/κL of ~5.2 × 103 cm3 K J−1 V−1. The measured maximum zT of 0.24 at 488 K and the estimated zT of ~0.8 at 1173 K in (Sr0.2Ba0.2Ca0.2Pb0.2La0.2)TiO3 film are among the best of n-type thermoelectric oxides. These results reveal that the entropy engineering may be a promising strategy to decouple the carrier-phonon transport and achieve higher zT in thermoelectrics. Authors propose an entropy engineering strategy to realize the carrier-phonon decoupling in SrTiO3-based perovskite thermoelectrics, reducing the lattice thermal conductivity nearly to the amorphous limit and improving the weighted mobility.
- Subjects
ENTROPY; PEROVSKITE; ENGINEERING; ELECTRICITY; OXIDES
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-52063-5