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Non-volatile resistive random-access memory (RRAM) is being promoted as a possible alternative to flash memory, however the optimal material system and sophisticated fabrication techniques hinder its utilization in practical routes. Here, we demonstrate the direct fabrication of metal/oxides/semiconductor (MOS) structured Ag/VO 2 (B)/SiO x /n ++ Si RRAM via drop-coating process, in which bipolar resistive switching behavior was obtained and investigated systematically. The RRAM devices exhibit good cycle-to-cycle endurance (&gt;30 cycles) and high on/off ratio (&gt;60). The switching mechanism is proposed to form Ag conducting filaments via VO 2 (B) nanorods’ guide by comparing the resistive switching behavior of Ag/SiO x /n ++ Si, Ag/VO 2 (B)/n ++ Si, Ag/VO 2 (B)/SiO x /n ++ Si devices and the corresponding SEM images before and after the application of electric field, which is confirmed by introducing NaCl barrier layer in Ag/VO 2 (B)-NaCl/SiO x /n ++ Si devices. The present study may pave a convenient route for fabricating the ultrahigh density resistive memory devices without the aid of complex fabrication techniques, as well as provide a new potential material system for RRAM.

Bipolar resistive switching in Ag/VO2(B)/SiOx/n++Si RRAM

Bipolar resistive switching in Ag/VO₂(B)/SiO_x/n⁺⁺Si RRAM