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Impedance and Mott-Schottky Analysis of a Pr0.15Ce0.85O2-x Solid Solution

Published online by Cambridge University Press:  11 February 2011

R. Bouchet,
P. Knauth,
T. Stefanik and
H. L. Tuller
R. Bouchet
Affiliation:
MADIREL, Université de Provence-CNRS (UMR 6121), Centre Saint-Jérôme, F-13397 Marseille Cedex 20, France
P. Knauth
Affiliation:
MADIREL, Université de Provence-CNRS (UMR 6121), Centre Saint-Jérôme, F-13397 Marseille Cedex 20, France
T. Stefanik
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA-02139, USA
H. L. Tuller
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA-02139, USA
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Abstract

The semiconductor properties of a praseodymium-cerium oxide solid solution with composition Pr0.15Ce0.85O2-x (PCO) were investigated by d.c. current-voltage and bias-dependent impedance measurements in aqueous solution. The solution data were compared with impedance values of dry cells in air. A Mott-Schottky analysis of the PCO-solution interface capacitance showed p-type semi conductivity, a flat-band potential Efb = (2.0 ± 0.1) V/NHE and an ionized acceptor density NA = 3 10 cm-3. Using these data, an electron hole mobility μh ∼ 10-5 cm2 V-1 s-1 was calculated pointing to a small polaron conduction mechanism with a hopping energy (Eh = 0.4 eV).

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References

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