Artificial synaptic and self-rectifying properties of crystalline (Na1-xKx)NbO3 thin films grown on Sr2Nb3O10 nanosheet seed layers

In Su Kim, Jong Un Woo, Hyun Gyu Hwang, Bumjoo Kim, Sahn Nahm

Research output: Contribution to journalArticlepeer-review

Abstract

Crystalline (Na1-xKx)NbO3 (NKN) thin films were deposited on Sr2Nb3O10/TiN/Si (S-TS) substrates at 370 °C. Sr2Nb3O10 (SNO) nanosheets served as a template for the formation of crystalline NKN films at low temperatures. When the NKN film was deposited on one SNO monolayer, the NKN memristor exhibited normal bipolar switching characteristics, which could be attributed to the formation and destruction of oxygen vacancy filaments. Moreover, the NKN memristor with one SNO monolayer exhibited artificial synaptic properties. However, the NKN memristor deposited on two SNO monolayers exhibited self-rectifying bipolar switching properties, with the two SNO monolayers acting as tunneling barriers in the memristor. The conduction mechanism of the NKN memristor with two SNO monolayers in the high-resistance state is attributed to Schottky emission, direct tunneling, and Fowler–Nordheim (FN) tunneling. The current conduction in this memristor in the low-resistance state was governed by direct tunneling and FN tunneling. Additionally, the NKN memristor with two SNO monolayers exhibited large ON/OFF and rectification ratios and artificial synaptic properties. Therefore, an NKN memristor with two SNO monolayers can be used for fabricating artificial synaptic devices with a cross-point array structure.

Original languageEnglish
Pages (from-to)136-143
Number of pages8
JournalJournal of Materials Science and Technology
Volume123
DOIs
Publication statusPublished - 2022 Oct 1

Keywords

  • Artificial synaptic properties
  • Bipolar switching properties
  • Crystalline NKN thin film
  • Self-rectifying bipolar switching properties
  • SrNbO nanosheet seed layer

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Polymers and Plastics
  • Metals and Alloys
  • Materials Chemistry

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