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Title: Role of interface structure and chemistry in resistive switching of NiO nanocrystals on SrTiO{sub 3}

Nickel oxide (NiO) nanocrystals epitaxially grown on (001) strontium titanate (SrTiO{sub 3}) single crystal substrates were characterized to investigate interface morphology and chemistry. Aberration corrected high angle annular dark field scanning transmission electron microscopy reveals the interface between the NiO nanocrystals and the underlying SrTiO{sub 3} substrate to be rough, irregular, and have a lower average atomic number than the substrate or the nanocrystal. Energy dispersive x-ray spectroscopy and electron energy loss spectroscopy confirm both chemical disorder and a shift of the energy of the Ti L{sub 2,3} peaks. Analysis of the O K edge profiles in conjunction with this shift, implies the presence of oxygen vacancies at the interface. This sheds light into the origin of the previously postulated minority carriers’ model to explain resistive switching in NiO [J. Sullaphen, K. Bogle, X. Cheng, J. M. Gregg, and N. Valanoor, Appl. Phys. Lett. 100, 203115 (2012)].
Authors:
; ;  [1] ;  [2] ;  [3]
  1. School of Materials Science and Engineering, University of New South Wales, Sydney NSW 2052 (Australia)
  2. Department of Materials Engineering and Monash Centre for Electron Microscopy, Monash University, Melbourne VIC 3800 (Australia)
  3. Australian Centre for Microscopy and Microanalysis, University of Sydney, Sydney NSW 2006 (Australia)
Publication Date:
OSTI Identifier:
22269545
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 2; Journal Issue: 3; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; ENERGY-LOSS SPECTROSCOPY; EPITAXY; INTERFACES; MONOCRYSTALS; NANOSTRUCTURES; NICKEL OXIDES; PEAKS; STRONTIUM; STRONTIUM TITANATES; SUBSTRATES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY SPECTROSCOPY