Abstract
In this letter, we demonstrated improved resistive switching (RS) characteristics for a complementary metal-oxide-semiconductor compatible Ni/Ti/Al2O3/SiO2/Si device structure. The robust SiO2 layer deposited by the additional low-pressure chemical vapor deposition process can improve the RS characteristics such as the endurance cycle, current level, and on/off ratio. Moreover, the multilevel capability is enhanced in the bilayer structure; the larger the reset stop voltage, the greater the on/off ratio demonstrated. Furthermore, for practical RS operation, several resistance states were obtained by adjusting the pulse amplitude. This property is desirable for highly integrated nonvolatile memory applications.
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