Bulletin of the American Physical Society
APS March Meeting 2013
Volume 58, Number 1
Monday–Friday, March 18–22, 2013; Baltimore, Maryland
Session T4: Invited Session: Physics and Applications of Transparent Conducting Oxides
8:00 AM–11:00 AM,
Thursday, March 21, 2013
Room: Ballroom IV
Sponsoring Unit: FIAP
Chair: Chris Van de Walle, University of California, Santa Barbara
Abstract ID: BAPS.2013.MAR.T4.1
Abstract: T4.00001 : Transparent Conducting Oxides as Potential Thermoelectrics*
8:00 AM–8:36 AM
Preview Abstract Abstract
(Northwestern University, Evanston, IL)
Transparent conducting oxides (TCOs) in their less-doped semiconducting states have potential as thermoelectric oxides or TEOs. They are attractive as TEOs owing to: 1) their good thermochemical stability, 2) their n-type character (to complement existing p-type TEOs), and 3) their high electronic mobilities. The numerator of the TE figure of merit (Z), also known as the ``power factor'' (PF), is the product of the electronic conductivity and the square of the Seebeck coefficient. An experimental procedure named after its developer, ``Jonker'' analysis plots Seebeck coefficient vs. the natural logarithm of the electronic conductivity. Data for bulk ceramic specimens just prior to the onset of degeneracy tend to fall on a line of slope, k/e (k$=$Boltzmann constant, e$=$charge of the electron). From this line, the doping composition corresponding to the highest power factor can be determined and the PF optimized, based upon data from a few carefully chosen compositions. Subsequently, following a procedure originally derived by Ioffe, the zero-thermopower intercept of these Jonker lines can be directly related to the maximum achievable power factor for a given TEO. So-called ``Ioffe'' plots allow for meaningful comparisons between candidate TEO materials, and also indicate the minimum thermal conductivity required to achieve a target ZT value at the temperature of measurement. Results for TCO-based TEOs will be discussed for both simple and compound (including layered) materials.
*This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences as part of an Energy Frontier Research Center under grant no. DE-SC0001059.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2013.MAR.T4.1
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