High-performance in n-type PbTe-based thermoelectric materials achieved by synergistically dynamic doping and energy filtering
Article
Article Title | High-performance in n-type PbTe-based thermoelectric materials achieved by synergistically dynamic doping and energy filtering |
---|---|
ERA Journal ID | 201288 |
Article Category | Article |
Authors | Liu, Hang-Tian (Author), Sun, Qiang (Author), Zhong, Yan (Author), Deng, Qian (Author), Gan, Lin (Author), Lv, Fang-Lin (Author), Shi, Xiao-Lei (Author), Chen, Zhi-Gang (Author) and Ang, Ran (Author) |
Journal Title | Nano Energy |
Journal Citation | 91, pp. 1-9 |
Article Number | 106706 |
Number of Pages | 9 |
Year | 2022 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 2211-2855 |
2211-3282 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.nanoen.2021.106706 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S2211285521009563 |
Abstract | The development of n-type high-performance PbTe thermoelectric materials for matching its p-type counterparts is an urgent matter to expand its practical applications. Here, we introduce Ag2Te into n-type Pb0.975Cr0.025Te for achieving a high peak figure of merit of 1.5 at 773 K. Such a high value is attributed to the synergistic optimization of carrier and phonon transports by Ag2Te introducing and the dynamic doping of Ag. From the detailed structure and property analysis, we found that Ag2Te nanoprecipitates establish coherent interfaces and hence potential barriers with the matrix to induce energy-dependent carrier scattering and maintain relatively high carrier mobility, leading to an optimal electrical-transport properties over a wide temperature range. Moreover, we employ comprehensive electron microscopy investigations and approximate Debye-Callaway model to reveal the origin of the significantly reduced lattice thermal conductivity in Ag2Te-alloyed Pb0.975Cr0.025Te. The strategies used here provide an effective method for designing high-performance thermoelectric material systems. |
Keywords | Coherent scattering; IV-VI semiconductors; Lead compounds; Precipitation (chemical); Thermal conductivity; Thermoelectric equipment; Thermoelectricity |
ANZSRC Field of Research 2020 | 401605. Functional materials |
Byline Affiliations | Sichuan University, China |
University of Queensland | |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6w39/high-performance-in-n-type-pbte-based-thermoelectric-materials-achieved-by-synergistically-dynamic-doping-and-energy-filtering
Download files
131
total views54
total downloads1
views this month0
downloads this month