Nanoscale resistive switching schottky contacts on self-assembled Pt nanodots on SrTiO3

Hyunsoo Lee, Haeri Kim, Trong Nghia Van, Dong Wook Kim, Jeong Young Park

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

A nanoscale Schottky diode using Pt nanodisks on a Nb-doped SrTiO 3 (Nb:STO) single crystal was fabricated, and resistive switching (RS) was demonstrated with conductive atomic force microscopy at ultrahigh vacuum. Pt disks with diameters on the order of 10 nm were formed using colloidal self-assembled patterns of silica nanospheres, followed by evaporation of the Pt layers on the Nb:STO single crystal. Here we show that the reproducible bipolar RS behavior of the nanoscale Pt/Nb:STO Schottky junction was achieved by utilizing local current-voltage spectroscopy. The conductance images, obtained simultaneously with topographic images, show the homogeneous current distribution of selected triangular-shaped Pt nanodisks during repetitive resistive switching between the high-resistance state (HRS) and low-resistance state (LRS). The endurance characteristics of the Pt/Nb:STO junction exhibit reliable switching behavior. These results suggest that the rectifying and resistive Pt/Nb:STO junction can be scaled down to the 10 nm range and their position can be controlled.

Original languageEnglish
Pages (from-to)11668-11672
Number of pages5
JournalACS Applied Materials and Interfaces
Volume5
Issue number22
DOIs
StatePublished - 27 Nov 2013

Keywords

  • conductive atomic force microscopy
  • Pt/Nb-doped SrTiO single crystal
  • scaling down
  • Schottky junction
  • spatial mapping

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