Abstract
Emerging resistive switching random access memory (RRAM), considered as the most promising candidate of flash memory, is favorable for in flexible electronic system. However, in high density flexible crossbar RRAM array, crosstalk issue that currents from the neighboring unselected cell lead to failure of write and read operations, still keeps a main bottleneck. Therefore, flexible selector compatible with the flexibility of the RRAM array should be focused on to configure one selector-one resistor (1S1R) system, which is immune to crosstalk issue. In this paper, flexible cation-based threshold switching (TS) selectors (Pt/Ag/HfO2/Pt/Ti/parylene) are fabricated and the compressive performance is studied systematically. The device shows excellent bidirectional volatile TS characteristics, including high selectivity ratio (109), low operating voltages (|VTH|<1 V), ultra-low leakage current (~10−13 A) and good flexibility. The successful demonstration of the wire connected 1S1R unit comprising this flexible selector and one bipolar resistor cell indicates the great potential of this cation-based selector to restrain the crosstalk issue in a large flexible RRAM array.
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