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Title: Resistive switching of a TaO{sub x}/TaON double layer via ionic control of carrier tunneling

Resistance random access memory (RRAM) is an attractive candidate for future non-volatile memory due to its superior features. As the oxide thickness is scaled down, the charge transport mechanism is also subject to the transition from hopping to tunneling dominant process, which is critically related to the interfacial electronic band structure. A TaO{sub x}/TaON double layer-based RRAM is fabricated and characterized in this work. Upon TaON insertion at the lower interface, the improved switching behavior is observed. The TaON at the bottom electrode interface blocks oxygen vacancy percolation due to strong N-O bonds and also modifies interfacial band alignment to lower the injected electron energy from bottom electrode due to higher tunneling barrier height than that of TaO{sub x}/Pt. This study suggested that a defect-minimized insertion layer like TaON with a proper interfacial band alignment is pivotal in RRAM for the effective ionic control of carrier tunneling resulting in non-linear I-V behavior with improved properties.
Authors:
; ;  [1] ; ;  [2] ;  [2] ;  [3] ;  [4] ;  [1] ;  [3]
  1. Department of Nano-Scale Semiconductor Engineering, Hanyang University, Seoul 133-791 (Korea, Republic of)
  2. Division of Materials Science and Engineering, Hanyang University, Seoul 133-791 (Korea, Republic of)
  3. (Korea, Republic of)
  4. Department of Materials Science and Engineering and Department of Energy Systems Research, Ajou University, Suwon 443-739 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22262589
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CARRIERS; CHARGE TRANSPORT; ELECTRIC CONDUCTIVITY; ELECTRONS; MEMORY DEVICES; PLATINUM; SWITCHES; TANTALUM OXIDES; TUNNEL EFFECT; VACANCIES