Journal
NANO LETTERS
Volume 18, Issue 4, Pages 2557-2563Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b00263
Keywords
BixSb2-xTe3; nanocrystal; crystal texture; liquid phase sintering; thermoelectric; energy conversion
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Funding
- European Regional Development Funds
- China Scholarship Council
- European Union (EU) via FP7 ERC Starting Grant (Project NANOSOLID) [306733]
- Programa Internacional de Becas 'la Caixa'-Severo Ochoa
- Generalitat de Catalunya [2014 SGR 1638]
- Severo Ochoa Programme (MINECO) [SEV-2013-0295]
- CERCA Programme/Generalitat de Catalunya
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Bottom-up approaches for producing bulk nanomaterials have traditionally lacked control over the crystallographic alignment of nanograins. This limitation has prevented nanocrystal-based nanomaterials from achieving optimized performances in numerous applications. Here we demonstrate the production of nanostructured BixSb2-xTe3 alloys with controlled stoichiometry and crystallographic texture through proper selection of the starting building blocks and the adjustment of the nanocrystal-to-nanomaterial consolidation process. In particular, we hot pressed diskshaped BixSb2-xTe3 nanocrystals and tellurium nanowires using multiple pressure and release steps at a temperature above the tellurium melting point. We explain the formation of the textured nanomaterials though a solution-reprecipitation mechanism under a uniaxial pressure. Additionally, we further demonstrate these alloys to reach unprecedented thermoelectric figures of merit, up to ZT = 1.96 at 420 K, with an average value of ZT(ave) = 1.77 for the record material in the temperature range 320-500 K, thus potentially allowing up to 60% higher energy conversion efficiencies than commercial materials.
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