Dual-functional memory and threshold resistive switching based on the push-pull mechanism of oxygen ions

Yi Jen Huang, Shih Chun Chao, Der Hsien Lien, Cheng Yen Wen, Jr Hau He, Si Chen Lee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

The combination of nonvolatile memory switching and volatile threshold switching functions of transition metal oxides in crossbar memory arrays is of great potential for replacing charge-based flash memory in very-large-scale integration. Here, we show that the resistive switching material structure, (amorphous TiO x)/(Ag nanoparticles)/(polycrystalline TiO x), fabricated on the textured-FTO substrate with ITO as the top electrode exhibits both the memory switching and threshold switching functions. When the device is used for resistive switching, it is forming-free for resistive memory applications with low operation voltage (<±1 V) and self-compliance to current up to 50 1/4A. When it is used for threshold switching, the low threshold current is beneficial for improving the device selectivity. The variation of oxygen distribution measured by energy dispersive X-ray spectroscopy and scanning transmission electron microscopy indicates the formation or rupture of conducting filaments in the device at different resistance states. It is therefore suggested that the push and pull actions of oxygen ions in the amorphous TiO x and polycrystalline TiO x films during the voltage sweep account for the memory switching and threshold switching properties in the device.

Original languageEnglish
Article number23945
JournalScientific reports
Volume6
DOIs
StatePublished - 7 Apr 2016

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