TID Effect and Damage Model of 60CO γ for the TiO2 Nano-Rod-Based Resistive Switching Memory

The degradation trend and the degradation mechanism of the total ionizing dose effects on the TiO2 nano-rod arrays (NRAs)-based resistive random access memory (ReRAM) is studied by exploiting the memory to the 60Co <inline-formula> <tex-math notation="LaTeX">$\gamma $ </tex-math></inline-formula>-rays. The results show that the typical bipolar <inline-formula> <tex-math notation="LaTeX">${I}$ </tex-math></inline-formula>–<inline-formula> <tex-math notation="LaTeX">${V}$ </tex-math></inline-formula> behaviors of the prepared Pt/TiO2 NRAs/Ti ReRAM can be shown clearly after 1 Mrad (Si) irradiation. In detail, the resistance of the high resistance state (HRS) decreases with the total dose, while the low resistance state (LRS) is almost unchanged. When the radiation dose reaches 1 Mrad (Si), the value of HRS resistance is reduced by about 1 order of magnitude. Moreover, the RESET voltage shows a slight decrease with the total dose. X-ray photoelectron spectrometer (XPS) characterization of resistive switching materials shows that the radiation-induced non-lattice oxygen and oxygen vacancy are the main reason for the degradation of the HRS and RESET voltage. Based on the results, a mathematical model of the <inline-formula> <tex-math notation="LaTeX">${I}$ </tex-math></inline-formula>–<inline-formula> <tex-math notation="LaTeX">${V}$ </tex-math></inline-formula> curves which can suggest the changes of the resistance and voltage simultaneously for the ReRAM under irradiation is developed based on the VTEAM model. The simulation results under different total dose of irradiation are in good agreement with the experimental results. The results can provide a basis and guidance for the research on irradiation effect and the radiation hardening for the oxide-based ReRAM.