Enhanced thermal stability of Bi2Te3-based alloys via interface engineering with atomic layer deposition

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Title
Enhanced thermal stability of Bi2Te3-based alloys via interface engineering with atomic layer deposition
Author
Lim, Sang-SoonKim, Kwang-ChonJeon, HansolKim, Ju-YoungKang, Jun-YunPark, Hyung-HoBaek, Seung-HyubKim, Jin-SangKim, Seong Keun
Issue Date
2020-08
Publisher
ELSEVIER SCI LTD
Citation
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, v.40, no.10, pp.3592 - 3599
Abstract
The ease of Te sublimation from Bi2Te3-based alloys significantly deteriorates thermoelectric and mechanical properties via the formation of voids. We propose a novel strategy based on atomic layer deposition (ALD) to improve the thermal stability of Bi2Te3-based alloys via the encapsulation of grains with a ZnO layer. Only a few cycles of ZnO ALD over the Bi2Te27Se0.3 powders resulted in significant suppression of the generation of pores in Bi2Te27Se0.3 extrudates and increased the density even after post-annealing at 500 degrees C. This is attributed to the suppression of Te sublimation from the extrudates. The ALD coating also enhanced grain refinement in Bi2Te27Se0.3 extrudates. Consequently, their mechanical properties were significantly improved by the encapsulation approach. Furthermore, the ALD approach yields a substantial improvement in the figure-of-merit after the post-annealing. Therefore, we believe the proposed approach using ALD will be useful for enhancing the mechanical properties of Bi2Te3-based alloys without sacrificing thermoelectric performance.
URI
https://scholarworks.unist.ac.kr/handle/201301/32139
URL
https://www.sciencedirect.com/science/article/pii/S095522192030282X?via%3Dihub
DOI
10.1016/j.jeurceramsoc.2020.04.013
ISSN
0955-2219
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MSE_Journal Papers
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