3D Stackable Vertical Ferroelectric Tunneling Junction (V-FTJ) with on/off Ratio 1500x, Applicable Cell Current, Self-Rectifying Ratio 1000x, Robust Endurance of 10⁹ Cycles, Multilevel and Demonstrated Macro Operation Toward High-Density BEOL NVMs. - J.-Y. Lee; F.-S. Chang; Kuo-Yu Hsiang; P.-H. Chen; Z.-F. Luo; Z.-X. Li; J.-H. Tsai; C. W. Liu; Min-Hung Lee (VLSI Technology and Circuits, 2023)