Electronic Structure and Impurity Concentration for Conducting Region of Proton Conductor by Soft-X-ray Spectroscopy

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The electronic structure ofproton conductor BaCe0.9Y0.1O3.8 hin film prepared by RF magnetron sputtering have probed by soft-X-ray spectroscopy. The thin film was crystallized at 500℃, which corresponds to the temperature region of proton conduction. The proton conductivity of the thin film accords with that of the bulk crystal. The hole and acceptor level were observed in the band gap region by X-ray absorption spectroscopy. The oxygen defect-induced state was also observed at the bottom of the conduction band. From the quantitative analysis, the author have clarified that hole of 30% and oxygen vacancy of 70% is created in the crystal lattice against of acceptor concentration.