Abstract
An In–Ga–Zn–O (IGZO) memristor with double layers of different oxygen vacancy (VO) densities has been developed, and long-term memory towards neuromorphic applications has been confirmed. The IGZO layer of the higher VO density functions as a pseudo electrode to avoid the Schottky behavior, whereas that of the lower VO density functions as a conductance change layer. The long-term potentiation and long-term depression are observed based on the memristor characteristic by applying pulse voltages, which demonstrates the future possibility towards neuromorphic applications.
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