Zeier, Wolfgang G. and LaLonde, Aaron D. and Gibbs, Zachary M. and Heinrich, Christophe P. and Panthöfer, Martin and Snyder, G. Jeffrey and Tremel, Wolfgang (2012) Influence of a Nano Phase Segregation on the Thermoelectric Properties of the p-Type Doped Stannite Compound Cu_(2+x)Zn_(1−x)GeSe_4. Journal of the American Chemical Society, 134 (16). pp. 7147-7154. ISSN 0002-7863 http://resolver.caltech.edu/CaltechAUTHORS:20120525-083331115
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Engineering nanostructure in bulk thermoelectric materials has recently been established as an effective approach to scatter phonons, reducing the phonon mean free path, without simultaneously decreasing the electron mean free path for an improvement of the performance of thermoelectric materials. Herein the synthesis, phase stability, and thermoelectric properties of the solid solutions Cu_(2+x)Zn_(1–x)GeSe_4 (x = 0–0.1) are reported. The substitution of Zn^(2+) with Cu^+ introduces holes as charge carriers in the system and results in an enhancement of the thermoelectric efficiency. Nano-sized impurities formed via phase segregation at higher dopant contents have been identified and are located at the grain boundaries of the material. The impurities lead to enhanced phonon scattering, a significant reduction in lattice thermal conductivity, and therefore an increase in the thermoelectric figure of merit in these materials. This study also reveals the existence of an insulator-to-metal transition at 450 K.
|Additional Information:||© 2012 American Chemical Society. Received: February 13, 2012. Publication Date (Web): April 5, 2012. W.G.Z. thanks the Carl-Zeiss foundation and the Graduate School of Excellence MAINZ, funded by the State of Rhineland-Palatinate. We also acknowledge Alex Zevalkink for performing high-temperature Hall measurements at the Jet Propulsion Laboratory and Nick Heinz for obtaining EDS data and SEM micrographs.|
|Official Citation:||Influence of a Nano Phase Segregation on the Thermoelectric Properties of the p-Type Doped Stannite Compound Cu2+xZn1–xGeSe4 Wolfgang G. Zeier, Aaron LaLonde, Zachary M. Gibbs, Christophe P. Heinrich, Martin Panthöfer, G. Jeffrey Snyder, and Wolfgang Tremel Journal of the American Chemical Society 2012 134 (16), 7147-7154|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||25 May 2012 16:12|
|Last Modified:||26 Dec 2012 15:15|
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