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Title: Nanocomposites from Solution-Synthesized PbTe-BiSbTe Nanoheterostructure with Unity Figure of Merit at Low-Medium Temperatures (500-600 K)

Journal Article · · Advanced Materials
 [1];  [2];  [3];  [2];  [3];  [4];  [4];  [5];  [2];  [2];  [1]
  1. Iowa State Univ., Ames, IA (United States)
  2. Northwestern Univ., Evanston, IL (United States)
  3. Purdue Univ., West Lafayette, IN (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. 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
Citation Metrics:
Cited by: 71 works
Citation information provided by
Web of Science

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Cited By (9)

Large-Scale, Solution-Synthesized Nanostructured Composites for Thermoelectric Applications journal August 2018
Nanowire Genome: A Magic Toolbox for 1D Nanostructures journal September 2019
High Performance Thermoelectric Materials: Progress and Their Applications journal November 2017
Creating Zipper-Like van der Waals Gap Discontinuity in Low-Temperature-Processed Nanostructured PbBi 2 n Te 1+3 n : Enhanced Phonon Scattering and Improved Thermoelectric Performance journal July 2018
Investigation on structure and thermoelectric properties in p-type Bi0.48Sb1.52Te3 via PbTe incorporating journal February 2018
Enhancement of thermoelectric performance through synergy of Pb acceptor doping and superstructure modulation for p-type Bi2Te3 journal December 2019
Suppressed intrinsic excitation and enhanced thermoelectric performance in Ag x Bi 0.5 Sb 1.5−x Te 3 journal January 2017
Flexible thermoelectric generators with inkjet-printed bismuth telluride nanowires and liquid metal contacts journal January 2019
Carbon-Based Materials for Thermoelectrics journal July 2018