Relationship among Current Fluctuations during Forming, Cell-To-Cell Variability and Reliability in RRAM Arrays

In this work, cells behavior during forming is monitored through an incremental pulse and verify algorithm on 4kbit RRAM arrays. This technique allows recognising different cell behaviors in terms of read-verify current oscillation: the impact of these oscillations on reliability and cell-to-cell variability has been investigated during 1k endurance cycles and 100k pulse stress under a variety of cycling conditions. Conductance histograms for the post-forming current reveal the nanosized nature of the filamentary paths across the dielectric film