n-type Bi2Te3-xSex nanoplates with enhanced thermoelectric efficiency driven by wide-frequency phonon scatterings and synergistic carrier scatterings
Article
Article Title | n-type Bi2Te3-xSex nanoplates with enhanced thermoelectric efficiency driven by wide-frequency phonon scatterings and synergistic carrier scatterings |
---|---|
ERA Journal ID | 35029 |
Article Category | Article |
Authors | Hong, Min (Author), Chasapis, Thomas C. (Author), Chen, Zhi Gang (Author), Yang, Lei (Author), Kanatzidis, Mercouri G. (Author), Snyder, G. Jeffrey (Author) and Zou, Jin (Author) |
Journal Title | ACS Nano |
Journal Citation | 10 (4), pp. 4719-4727 |
Number of Pages | 9 |
Year | 2016 |
Publisher | American Chemical Society |
Place of Publication | United States |
ISSN | 1936-0851 |
1936-086X | |
Digital Object Identifier (DOI) | https://doi.org/10.1021/acsnano.6b01156 |
Web Address (URL) | http://pubs.acs.org/doi/abs/10.1021/acsnano.6b01156 |
Abstract | Driven by the prospective applications of thermoelectric materials, massive efforts have been dedicated to enhancing the conversion efficiency. The latter is governed by the figure of merit (ZT), which is proportional to the power factor (S2σ) and inversely proportional to the thermal conductivity (κ). Here, we demonstrate the synthesis of high-quality ternary Bi2Te3-xSex nanoplates using a microwave-assisted surfactant-free solvothermal method. The obtained n-type Bi2Te2.7Se0.3 nanostructures exhibit a high ZT of 1.23 at 480 K measured from the corresponding sintered pellets, in which a remarkably low κ and a shift of peak S2σ to high temperature are observed. By detailed electron microscopy investigations, coupled with theoretical analysis on phonon transports, we propose that the achieved κ reduction is attributed to the strong wide-frequency phonon scatterings. The shifting of peak S2σ to high temperature is due to the weakened temperature dependent transport properties governed by the synergistic carrier scatterings and the suppressed bipolar effects by enlarging the band gap. |
Keywords | Bi2Te3-xSex; nanostructuring; synergistic carrier scatterings; thermoelectric; wide-frequency phonon scatterings; Carrier scattering; Nano-structuring; Prospective applications; Solvothermal method; Temperature dependent; Thermo-Electric materials; Thermoelectric efficiency; Thermodynamics; |
ANZSRC Field of Research 2020 | 401699. Materials engineering not elsewhere classified |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Queensland |
Northwestern University, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q414x/n-type-bi2te3-xsex-nanoplates-with-enhanced-thermoelectric-efficiency-driven-by-wide-frequency-phonon-scatterings-and-synergistic-carrier-scatterings
1261
total views10
total downloads0
views this month0
downloads this month