The Oxygen Partial Pressure Dependence of Space Charges at SrTiO3|Mixed Ionic Electronic Conducting Oxide Heterojunctions
Claudia Steinbach, Alexander Schmid, Tobias M. Huber, Juergen Fleig
TL;DR
This study explores how oxygen levels affect electrical properties at the interface of two types of oxides, offering a model to predict these changes.
Contribution
A new model is introduced to explain and predict p(O2) dependencies of space charge potentials at MIEC|MIEC interfaces.
Findings
Space charge potentials decrease with decreasing oxygen partial pressure.
The model successfully links Δϕ changes to p(O2) dependent defect concentrations in MIECs.
The model can predict transitions between hole and electron depleted layers.
Abstract
The electrical and electrochemical properties of mixed conducting oxides often depend on the oxygen partial pressure p(O2) and numerous studies have dealt with the p(O2) dependencies found in bulk materials. However, measurements regarding the properties of interfaces between two different mixed conducting oxides are much less common. This work investigates the interfacial space charge region in SrTiO3 (STO) caused by the contact with another mixed ionic and electronic conductor (MIEC), specifically La0.6Sr0.4FeO3−δ (LSF), La0.65Sr0.35MnO3−δ (LSM) and La0.9Sr0.1CrO3−δ (LSCr). The space charge regions were investigated by means of electrochemical impedance spectroscopy at 500 °C in the broad p(O2) range of 1 bar to 10−32 bar. All measurable space charge potentials Δϕ show a decrease with decreasing p(O2). A model correlates the change in Δϕ with the strongly p(O2) dependent defect…
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Taxonomy
TopicsElectronic and Structural Properties of Oxides · Advancements in Solid Oxide Fuel Cells · Semiconductor materials and devices