Resistance Switching Characteristics in ZnO-Based Nonvolatile Memory Devices

الملخص EN

Bipolar resistance switching characteristics are demonstrated in Pt/ZnO/Pt nonvolatile memory devices.

A negative differential resistance or snapback characteristic can be observed when the memory device switches from a high resistance state to a low resistance state due to the formation of filamentary conducting path.

The dependence of pulse width and temperature on set/reset voltages was examined in this work.

The exponentially decreasing trend of set/reset voltage with increasing pulse width is observed except when pulse width is larger than 1 s.

Hence, to switch the ZnO memory devices, a minimum set/reset voltage is required.

The set voltage decreases linearly with the temperature whereas the reset voltage is nearly temperature-independent.

In addition, the ac cycling endurance can be over 106 switching cycles, whereas, the dependence of HRS/LRS resistance distribution indicates that a significant memory window closure may take place after about 102 dc switching cycles.