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  Synergistic modulation of mobility and thermal conductivity in (Bi,Sb)2Te3 towards high thermoelectric performance

Pan, Y., Qiu, Y., Witting, I., Zhang, L., Fu, C., Li, J.-W., et al. (2019). Synergistic modulation of mobility and thermal conductivity in (Bi,Sb)2Te3 towards high thermoelectric performance. Energy & Environmental Science, 12(2), 624-630. doi:10.1039/c8ee03225d.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-321C-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-3224-C
Genre: Journal Article

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 Creators:
Pan, Yu1, Author              
Qiu, Yang2, Author
Witting, Ian2, Author
Zhang, Liguo1, Author              
Fu, Chenguang1, Author              
Li, Jing-Wei2, Author
Huang, Yi2, Author
Sun, Fu-Hua2, Author
He, Jiaqing2, Author
Snyder, G. Jeffrey2, Author
Felser, Claudia3, Author              
Li, Jing-Feng2, Author
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: Modulating microstructures in a wide range from atomic defects to microscale structures independently can partially decouple the transport of charge carriers and phonons and thus enhance the figure of merit (zT) of thermoelectric materials. High mobility requires atomic scale purity, while introducing nanoscopic inhomogeneities leads to low thermal conductivity. Through a two-step sintering process with excess Te, lower reduction of mobility and decreased thermal conductivity were simultaneously achieved in (Bi,Sb)(2)Te-3. Grain boundaries and defects that strongly impede charge carrier transport are reduced by the two-step sintering process leading to a higher mobility compared to that of the one-step sintered bulk. At the same time, removal of Te as well as Sb-rich inhomogeneities with lattice misfit to the matrix decreased the thermal conductivity. In this way, simultaneous maintenance of high mobility and low lattice thermal conductivity was illustrated. By further optimization of carrier concentration, the produced material showed an encouraging zT value of 1.38 at 323 K. The present work demonstrates a method for synthesizing high-efficiency thermoelectric materials through simultaneous optimization of the electrical and thermal transport properties.

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Language(s): eng - English
 Dates: 2019-01-232019-01-23
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000459741700010
DOI: 10.1039/c8ee03225d
 Degree: -

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Title: Energy & Environmental Science
  Abbreviation : Energy Environ. Sci.
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 12 (2) Sequence Number: - Start / End Page: 624 - 630 Identifier: ISSN: 1754-5692
CoNE: https://pure.mpg.de/cone/journals/resource/1754-5692