Abstract
X-ray photoelectron spectroscopy (XPS) has revealed that the “natural barrier” on a Ba1-XKXBiO3 (BKBO) thin-film surface is composed of a K-compound layer and a nonstoichiometric layer resulting from Ba depletion. An Au/BKBO junction was fabricated at various temperatures, and its electrical properties were investigated. Junction resistivity could be reproducibly controlled between 10-1 and 10-5 Ω·cm2 by varying the temperature of Au deposition between room temperature (RT) and 300°C. The decrease in junction resistivity with increasing Au-deposition temperature was found to be a result of decomposition of the K-compound layer and rearrangement of the nonstoichiometric layer by annealing the BKBO film.
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