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Dual defect system of tellurium antisites and silver interstitials in off-stoichiometric Bi2(Te,Se)3+Y causing enhanced thermoelectric performance

Title
Dual defect system of tellurium antisites and silver interstitials in off-stoichiometric Bi2(Te,Se)3+Y causing enhanced thermoelectric performance
Authors
Kim, ChamLopez, David HumbertoKim, Dong HwanKim, Hoyoung
DGIST Authors
Kim, ChamKim, Dong HwanKim, Hoyoung
Issue Date
2019-01
Citation
Journal of Materials Chemistry A, 7(2), 791-800
Type
Article
Article Type
Article
Keywords
BISMUTH-TELLURIDEBI2TE3 POWDERHIGH FIGURECRYSTALSPOLYMERSPOWER
ISSN
2050-7488
Abstract
Enhancement in the thermoelectric performance of n-type Bi2(Te,Se)3 was accomplished by forming a dual defect system composed of Te- and Ag-related defects. Te-rich Bi2(Te,Se)3+y, which has antisite defects generated by an excess of Te, was prepared via a conventional melting process. We devised a one-pot process in which Ag nanoparticles were deposited onto the Te-rich Bi2(Te,Se)3+y as soon as they were chemically synthesized, followed by a sintering compaction; thus, we aimed at selective insertion of Ag atoms into the interstitial sites of the Te-rich Bi2(Te,Se)3+y. The resulting Ag interstitials interact with the Te antisite defects to vary the thermoelectric transport properties of the product. We endeavored to balance the concentration of the defects to maximize the phonon glass electron crystal (PGEC) characteristic of the product, resulting in excellent thermoelectric performance in low temperature regions-we achieved the highest ZT average values, below 150 °C (ZTave = 1.18 (25-100 °C) and 1.15 (25-150 °C)), ever reported for n-type Bi2(Te,Se)3 materials. © 2019 The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/9529
DOI
10.1039/c8ta05261a
Publisher
Royal Society of Chemistry
Related Researcher
Files:
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Collection:
Division of Nanotechnology1. Journal Articles


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