Ag:SiOxNy-Based Bilayer ReRAM Structure with Self-Limiting Bidirectional Threshold Switching Characteristics for Cross-Point Array Application

We fabricate a Pt/Ag:SiOxNy/Ti programmable metallization cell exhibiting bidirectional threshold switching (TS) or nonvolatile resistive switching (RS) characteristics through a simple thermal annealing process. The cell composed of pristine Ag:SiOxNy layers showed self-limiting TS characteristics with high selectivity and extremely low OFF currents, whereas the same cell showed typical RS characteristics after thermal annealing at 250 degrees C. The operating mechanism was investigated using scanning transmission electron microscopy and X-ray photoelectron spectroscopy. Next, a Ag:SiOxNy-based one selector-one resistor device was fabricated by employing both TS and RS characteristics in a single cell, which exhibited excellent self-rectifying memory performance.