Journal
NANO LETTERS
Volume 12, Issue 1, Pages 56-60Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl202935k
Keywords
Bi2Te3; nanowires; thermoelectric; spark plasma sintering
Categories
Funding
- Purdue University
- Midwest Institute of Nanoelectronic Discovery (MIND)
- DuPont Young Faculty Award
- NSF/DOE [1048616]
- MIND
- Purdue Cooling Technologies Research Center
- Intel Corporation
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A rational yet scalable solution phase method has been established, for the first time, to obtain n-type Bi2Te3 ultrathin nanowires with an average diameter of 8 nm in high yield (up to 93%). Thermoelectric properties of bulk pellets fabricated by compressing the nanowire powder through spark plasma sintering have been investigated. Compared to the current commercial n-type Bi2Te3-based bulk materials, our nanowire devices exhibit an enhanced ZT of 0.96 peaked at 380 K due to a significant reduction of thermal conductivity derived from phonon scattering at the nanoscale interfaces in the bulk pellets, which corresponds to a 13% enhancement compared to that of the best n-type commercial Bi2Te2.7Se0.3 single crystals (similar to 0.85)and is comparable to the best reported result of n-type Bi2Te2.7Se0.3 sample (ZT = 1.04) fabricated by the hot pressing of ball-milled powder. The uniformity and high yield of the nanowires provide a promising route to make significant contributions to the manufacture of nanotechnology-based thermoelectric power generation and solid-state cooling devices with superior performance in a reliable and a reproducible way.
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