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Impact of Rapid Thermal Annealing on Thermoelectric Properties of Bulk Nanostructured Zinc Oxide

Published online by Cambridge University Press:  07 August 2013

Markus Engenhorst ,
Devendraprakash Gautam ,
Carolin Schilling ,
Markus Winterer ,
Gabi Schierning  and
Roland Schmechel
Markus Engenhorst
Affiliation:
Faculty of Engineering and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany
Devendraprakash Gautam
Affiliation:
Faculty of Engineering and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany
Carolin Schilling
Affiliation:
Faculty of Engineering and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany
Markus Winterer
Affiliation:
Faculty of Engineering and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany
Gabi Schierning
Affiliation:
Faculty of Engineering and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany
Roland Schmechel
Affiliation:
Faculty of Engineering and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany
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Abstract

In search for non-toxic thermoelectric materials that are stable in air at elevated temperatures, zinc oxide has been shown to be one of only few efficient n-type oxidic materials. Our bottom-up approach starts with very small (<10 nm) Al-doped ZnO nanoparticles prepared from organometallic precursors by chemical vapor synthesis using nominal doping concentrations of 2 at% and 8 at%. In order to obtain bulk nanostructured solids, the powders were compacted in a current-activated pressure-assisted densification process. Rapid thermal annealing was studied systematically as a means of further dopant activation. The thermoelectric properties are evaluated with regard to charge carrier concentration and mobility. A Jonker-type analysis reveals the potential of our approach to achieve high power factors. In the present study, power factors larger than 4×10-4 Wm-1K-2 were measured at temperatures higher than 600 °C.

Keywords

thermoelectricitynanostructuresemiconducting
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1543: Symposium H – Nanoscale Thermoelectric Materials, Thermal and Electrical Transport, and Applications to Solid-State Cooling and Power Generation , 2013 , pp. 99 - 104
Copyright
Copyright © Materials Research Society 2013 

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References

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