Nanocomposites from Solution-Synthesized PbTe-BiSbTe Nanoheterostructure with Unity Figure of Merit at Low-Medium Temperatures (500-600 K)
- Iowa State Univ., Ames, IA (United States)
- Northwestern Univ., Evanston, IL (United States)
- Purdue Univ., West Lafayette, IN (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. of Cincinnati, Cincinnati, OH (United States)
The large-scale implementation of thermoelectric devices is inhibited, in part, by the limited temperature range where each material can operate at its highest efficiency, as evaluated by the dimensionless figure of merit (zT = S2σT/κ). To date, Bi2Te3-based materials have been restricted to zT ≥ 1 between 300-500 K, before the onset of bipolar conduction reduces the zT significantly. Herein, we show that a scalable, low-temperature solution process method can be used to synthesize precursor material for Pb-doped BixSb2-xTe3 bulk nanocomposites with a zT = 1 over the 500-600 K range, making this material suitable for low-grade waste heat recovery for the first time. Our success in increasing the efficiency of p-type BixSb2-xTe3 at higher temperatures can be largely explained by the increase in the optical band gap, according to the Burstein-Moss shift, due to Pb doping, thus delaying the onset of bipolar conduction. Furthermore, the solution synthesis method enabled controlled nanostructuring of the bulk materials, which greatly reduced the thermal conductivity over the investigated temperature range. Lastly, our scalable synthesis processing method may be applicable to not only other thermoelectrics, but also in fields such as photocatalysis, electronics and optoelectronics.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0001299; FG02-09ER46577; SC0014520
- OSTI ID:
- 1388397
- Journal Information:
- Advanced Materials, Vol. 29, Issue 10; Related Information: S3TEC partners with Massachusetts Institute of Technology (lead); Boston College; Oak Ridge National Laboratory; Rensselaer Polytechnic Institute; ISSN 0935-9648
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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Related Subjects
solar (photovoltaic)
solar (thermal)
solid state lighting
phonons
thermal conductivity
thermoelectric
defects
mechanical behavior
charge transport
spin dynamics
materials and chemistry by design
optics
synthesis (novel materials)
synthesis (self-assembly)
synthesis (scalable processing)
nanocomposites
nanoheterostructures
solution synthesis