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Determining conductivity and mobility values of individual components in multiphase composite Cu_(1.97)Ag_(0.03)Se

Day, Tristan W. and Zeier, Wolfgang G. and Brown, David R. and Melot, Brent C. and Snyder, G. Jeffrey (2014) Determining conductivity and mobility values of individual components in multiphase composite Cu_(1.97)Ag_(0.03)Se. Applied Physics Letters, 105 (17). Art. No. 172103. ISSN 0003-6951. http://resolver.caltech.edu/CaltechAUTHORS:20141103-090752822

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Abstract

The intense interest in phase segregation in thermoelectrics as a means to reduce the lattice thermal conductivity and to modify the electronic properties from nanoscale size effects has not been met with a method for separately measuring the properties of each phase assuming a classical mixture. Here, we apply effective medium theory for measurements of the in-line and Hall resistivity of a multiphase composite, in this case Cu_(1.97) Ag_(0.03)Se. The behavior of these properties with magnetic field as analyzed by effective medium theory allows us to separate the conductivity and charge carrier mobility of each phase. This powerful technique can be used to determine the matrix properties in the presence of an unwanted impurity phase, to control each phase in an engineered composite, and to determine the maximum carrier concentration change by a given dopant, making it the first step toward a full optimization of a multiphase thermoelectric material and distinguishing nanoscale effects from those of a classical mixture.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://scitation.aip.org/content/aip/journal/apl/105/17/10.1063/1.4897435PublisherArticle
http://dx.doi.org/10.1063/1.4897435DOIArticle
ORCID:
AuthorORCID
Snyder, G. Jeffrey0000-0003-1414-8682
Alternate Title:Determining conductivity and mobility values of individual components in multiphase composite Cu1.97Ag0.03Se
Additional Information:© 2014 AIP Publishing LLC. Received 12 August 2014; accepted 22 September 2014; published online 28 October 2014. T.W.D., D.R.B., and G.J.S. are grateful for the support of the AFOSR MURI program under FA9550-12-1-0002. D.R.B. acknowledges the support of the Resnick Institute. B.C.M. gratefully acknowledges financial support through start-up funding provided by the Dana and David Dornsife College of Letters and Sciences at the University of Southern California. W.G.Z. also acknowledges the support of a fellowship within the Postdoc-Program of the German Academic Exchange Service (DAAD).
Group:Resnick Sustainability Institute
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0002
Resnick Institute UNSPECIFIED
University of Southern California Dana and Dornsife College of Letters and SciencesUNSPECIFIED
German Academic Exchange Service (DAAD) UNSPECIFIED
Record Number:CaltechAUTHORS:20141103-090752822
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141103-090752822
Official Citation:Determining conductivity and mobility values of individual components in multiphase composite Cu1.97Ag0.03Se Tristan W. Day, Wolfgang G. Zeier, David R. Brown, Brent C. Melot and G. Jeffrey Snyder Appl. Phys. Lett. 105, 172103 (2014); http://dx.doi.org/10.1063/1.4897435
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51157
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:03 Nov 2014 20:46
Last Modified:18 Nov 2016 17:13

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