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Promoted Na Solubility and Modified Band Structure for Achieving Exceptional Average ZT by Extra Mn Doping in PbTe.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2024 Jan 31; Vol. 16 (4), pp. 4827-4835. Date of Electronic Publication: 2024 Jan 19. - Publication Year :
- 2024
-
Abstract
- Na doping strategy provides an effective avenue to upgrade the thermoelectric performance of PbTe-based materials by optimizing electrical properties. However, the limited solubility of Na inherently restricts the efficiency of doping, resulting in a relatively low average ZT , which poses challenges for the development and application of subsequent devices. Herein, to address this issue, the introduced spontaneous Pb vacancies and additional Mn doping synergistically promote Na solubility with a further modified valence band structure. Furthermore, the induced massive point defects and multiscale microstructure greatly strengthen the scattering of phonons over a wide frequency range, leading to a remarkable ultralow lattice thermal conductivity of ∼0.42 W m <superscript>-1</superscript> K <superscript>-1</superscript> . As a result, benefiting from the significantly enhanced Seebeck coefficient and superior thermal transports, a high peak ZT of ∼2.1 at 773 K and an excellent average ZT of ∼1.4 between 303 and 823 K are simultaneously achieved in Pb <subscript>0.93</subscript> Na <subscript>0.04</subscript> Mn <subscript>0.02</subscript> Te. This work proposes a simple and constructive method to obtain high-performance PbTe-based materials and is promising for the development of thermoelectric power generation devices.
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 16
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 38240675
- Full Text :
- https://doi.org/10.1021/acsami.3c17052