A non-linear ReRAM cell with sub-1μA ultralow operating current for high density vertical resistive memory (VRRAM)

A non-linear RRAM cell with sub-1μA ultralow operating current has been successfully fabricated for high density vertical ReRAM (VRRAM) applications. A uniform and reproducible low power resistive switching was achieved by engineering transition metal oxides and imposing thin insulating layer as a tunnel barrier. The non-linear I-V characteristics ensure the possible incorporation of RRAM cell into high density cross-type array structure including VRRAM. By varying the current compliance, a multi level switching behavior was obtained. Moreover, excellent endurance of more than 10⁷ cycles without read disturbance for up to 10⁴ seconds was demonstrated.