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To resolve the sneak leakage problem and reduce the power consumption in crossbar RRAM arrays, a Cu/Al 2 O 3 /aSi/Ta cell with self-rectifying characteristics is developed. The cell exhibits low operating current (~nA), high ON/OFF ratios (>100×), and pronounced nonlinearity. The use of low-programming-current RRAM elements avoids the current-driving capability bottleneck of selectors, while the integrated rectifying layer improves the RRAM operation reliability. Endurance of over 500 cycles with ~100 ON/OFF ratio was achieved without external current compliance. Even at such low programming levels, retention over 10 4 s at 100 °C can still be obtained.
Zhou et al. (2016) studied this question.
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