Journal
MATERIALS TODAY PHYSICS
Volume 2, Issue -, Pages 62-68Publisher
ELSEVIER
DOI: 10.1016/j.mtphys.2017.09.001
Keywords
Bismuth telluride; Thermoelectric; Ag doping; Hot deformation
Funding
- Natural Science Foundation of China [61534001, 11574267, 51571177]
Ask authors/readers for more resources
Bismuth-telluride-based alloys are the unique thermoelectric materials for state-solid refrigeration around room temperature. For n-type polycrystalline counterparts, maximum figure of merit zTs are often shifted above 400 K due to the increased carrier concentration induced by the donor-like effect during the pulverization of ingots. Herein, we report a synergistic optimization procedure, combining Ag doping with hot deformation, to boost room temperature thermoelectric performance of n-type polycrystalline Bi2Te2.7Se0.3 alloys. The Ag doping optimizes the carrier concentration, contributing to an improved power factor and a reduced electrical thermal conductivity. The hot deformation process improves the carrier mobility due to the enhanced texture. As a consequence, a zT value of 1.0 at 300 K and a peak zT of 1.1 at 350 K are obtained in the twice hot deformed Ag0.011Bi2Te2.7Se0.3 alloy, which makes the n-type polycrystalline Bi-2(Te, Se)(3) alloys more suitable for solid-state refrigeration near room temperature. (c) 2017 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available