Abstract
Abstract Vanadium dioxide VO2 thin films can be applied as electrolyte of electric double layer transistor or positive electrode for all-solid-state lithium-ions batteries. In order to verify the charge behavior between the Li+ ion conductor LiCoO2 and VO2, we have investigated the electrical conductivity and electronic structure of b-axis oriented VO2/LiCoO2 multilayer film prepared on Al2O3 (0001) substrates by RF magnetron sputtering. The amount of excess oxygen in the VO2/LiCoO2 multilayer film was evaluated to be ~22.5% by X-ray photoemission spectroscopy. The electrical resistivity of the multilayer film increases with temperature from 290 to 330K, and decreases reversibly above 330K, indicating the Li+ ion conduction. The electron correlation energy of the VO2/LiCoO2 multilayer and VO2 thin film are ~3.4 eV and ~2.4 eV, respectively. These results indicate that the carrier number of the VO2 thin film can control by diffusion of Li+ ions from LiCoO2 buffer layer.
Published Version
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