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, G. Jeffrey Snyder*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

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 Cu1.97Ag0.03Se. 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.

Original languageEnglish (US)
Article number172103
JournalApplied Physics Letters
Volume105
Issue number17
DOIs
StatePublished - Oct 27 2014

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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