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The bipolar resistive switching characteristics of atomic-layer-deposited NbAlO-based devices have been investigated for nonvolatile memory applications. With the help of a thin Al2O3 buffer layer, highly uniform and reproducible bipolar resistance switching cycles could be observed. Four typical multilevel operations, with resistances being at 1000, 350, 145, and 75 ??, respectively, are also successfully demonstrated by varying the current compliance during the set process. The resistance ratios of high-resistance state to low-resistance state are more than 103 within 5000 cycles during the test without any degradation. Moreover, the estimated retention lifetime at room temperature is sufficiently long to fulfill the typical ten-year requirement. Considering its excellent memory switching behavior, a resistance switching device composed of a NbAlO film with a thin Al2O3 buffer layer is a possible candidate to be integrated into future memory processes.
Date of Publication: April 2010