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TEM images of (a) conventional structure; (b) proposed novel structure; (c) top cell in the proposed novel structure; (d) bottom cell in the proposed novel structure. TEM images clearly show that the switching layers of top cell and bottom cell are a consecutive TaOx film in conventional structure while the switching regions are isolated by Si3N4 layer and confined to the Ta sidewall electrodes. The proposed SEO structure is well demonstrated here.
