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- Title
Divacancy and resonance level enables high thermoelectric performance in n-type SnSe polycrystals.
- Authors
Gong, Yaru; Dou, Wei; Lu, Bochen; Zhang, Xuemei; Zhu, He; Ying, Pan; Zhang, Qingtang; Liu, Yuqi; Li, Yanan; Huang, Xinqi; Iqbal, Muhammad Faisal; Zhang, Shihua; Li, Di; Zhang, Yongsheng; Wu, Haijun; Tang, Guodong
- Abstract
N-type polycrystalline SnSe is considered as a highly promising candidates for thermoelectric applications due to facile processing, machinability, and scalability. However, existing efforts do not enable a peak ZT value exceeding 2.0 in n-type polycrystalline SnSe. Here, we realized a significant ZT enhancement by leveraging the synergistic effects of divacancy defect and introducing resonance level into the conduction band. The resonance level and increased density of states resulting from tungsten boost the Seebeck coefficient. The combination of the enhanced electrical conductivity (achieved by increasing carrier concentration through WCl6 doping and Se vacancies) and large Seebeck coefficient lead to a high power factor. Microstructural analyses reveal that the co-existence of divacancy defects (Se vacancies and Sn vacancies) and endotaxial W- and Cl-rich nanoprecipitates scatter phonons effectively, resulting in ultralow lattice conductivity. Ultimately, a record-high peak ZT of 2.2 at 773 K is achieved in n-type SnSe0.92 + 0.03WCl6. N-type polycrystalline SnSe shows inferior ZT to p-type polycrystalline due to its high thermal conductivity and lower power factor. The authors overcome the problem via the synergy of divacancy defect and introducing resonance level into the conduction band.
- Subjects
POLYCRYSTALS; SEEBECK coefficient; RESONANCE; CONDUCTION bands; CARRIER density; PHONON scattering; CHARGE carriers
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-48635-0