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New Directions in Bulk Thermoelectric Materials Research: Synthesis of Nanoscale Precursors for “Bulk-Composite” Thermoelectric Materials

Published online by Cambridge University Press:  01 February 2011

Terry M. Tritt ,
Bo Zhang ,
Nick Gothard ,
Jian He ,
Xiaohua Ji ,
Daniel Thompson  and
Joe Kolis
Terry M. Tritt
Affiliation:
[email protected], Clemson University, Physics and Astronomy, 118 Kinard Physics Lab, Clemson, SC, 29634, United States, 1-864-6564597, 1-864-6560805
Bo Zhang
Affiliation:
[email protected], Clemson University, Dept. of Physics, United States
Nick Gothard
Affiliation:
[email protected], Clemson University, Dept. of Physics, United States
Jian He
Affiliation:
[email protected], Clemson University, Dept. of Physics, United States
Xiaohua Ji
Affiliation:
[email protected], Clemson University, Dept. of Physics, United States
Daniel Thompson
Affiliation:
[email protected], Clemson University, Dept. of Physics, United States
Joe Kolis
Affiliation:
[email protected], Clemson University, Dept. of Chemistry, United States
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Abstract

Over a decade ago it was predicted that nano-scaled thermoelectric (TE) materials might have superior properties to that of their bulk counterparts. Subsequently, a significant increase in the figure of merit, ZT (ZT > 2), has been reported for nano-scaled systems such as superlattice and quantum dot systems constituently based on those more commonly used bulk TE materials (e.g., Bi2Te3 and PbTe). However, the challenge remains to achieve these higher performance results in bulk materials in order to more rapidly incorporate them into standard TE devices. Recent theoretical work on boundary scattering of phonons in amorphous materials indicates that micron and submicron grains could be very beneficial in order to lower the lattice thermal conductivity and yet not deteriorate the electron mobility. The focus in this paper will be to highlight some of our new directions in bulk thermoelectric materials research. Thermoelectric materials are inherently difficult to characterize and these difficulties are magnified at high temperatures. Specific materials will be discussed, especially those bulk materials that exhibit favorable properties for potential high temperature power generation capabilities. One potentially fruitful research direction is to explore whether hybrid TE materials possess possible enhanced TE properties. These “engineered” hybrids include materials that exhibit sizes from on the order of a few nanometers to hundreds of nanometers of the initial materials. These initial materials are then incorporated into a bulk structure. A discussion of some of the future research directions that we are pursuing is highlighted, including some bulk materials, which are based on nano-scaled or hybrid composites. The synthesis techniques and the synthesis results of many of these nano-scale precursor materials will be a primary focus of this paper.

Keywords

thermoelectricitynanoscalecomposite
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 886: Symposium F – Materials and Technologies fore Direct Thermal-to-Electric Energy Conversion , 2005 , 0886-F02-01
Copyright
Copyright © Materials Research Society 2006

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