Chemical Vapor-Deposited Vanadium Pentoxide Nanosheets with Highly Stable and Low Switching Voltages for Effective Selector Devices

Sunghun Lee, Jinsu Kim, Jae Ho Jeon, Minho Song, Seonyeong Kim, Young Gyu You, Sung Ho Jhang, Sun Ae Seo, Seung Hyun Chun

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Recently, attempts to overcome the physical limits of memory devices have led to the development of promising materials and architectures for next-generation memory technology. The selector device is one of the essential ingredients of high-density stacked memory systems. However, complicated constituent deposition conditions and thermal degradation are problematic, even with effective selector device materials. Herein, we demonstrate the highly stable and low-threshold voltages of vanadium pentoxide (V 2 O 5 ) nanosheets synthesized by facile chemical vapor deposition, which have not been previously reported on the threshold switching (TS) properties. The electrons occupying trap sites in poly-crystalline V 2 O 5 nanosheet contribute to the perfectly symmetric TS feature at the bias polarity and low-threshold voltages in V 2 O 5 , confirmed by high-resolution transmission electron microscopy measurements. Furthermore, we find an additional PdO interlayer in V 2 O 5 nanodevices connected with a Pd/Au electrode after thermal annealing treatment. The PdO interlayer decreases the threshold voltages, and the I on /I off ratio increases because of the increased trap density of V 2 O 5 . These studies provide insights into V 2 O 5 switching characteristics, which can support low power consumption in nonvolatile memory devices.

Original languageEnglish
Pages (from-to)42875-42881
Number of pages7
JournalACS Applied Materials and Interfaces
Volume10
Issue number49
DOIs
StatePublished - 12 Dec 2018

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.

Keywords

  • nanosheets
  • selector devices
  • thermal annealing treatment
  • threshold switching
  • vanadium pentoxide

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