A flexible organic memory device with a clearly disclosed resistive switching mechanism

Giulia Casula, Yan Busby, Alexis Franquet, Valentina Spampinato, Laurent Houssiau, Annalisa Bonfiglio, Piero Cosseddu

Research output: Contribution to journalArticle

Abstract

Flexible electronics is one of the main challenges for future hi-tech electronics. Since information storage elements are essential in any electronic system, the development of high-performance and flexible organic memories is a key requirement. Organic resistive switching memories represent a viable and promising technology ensuring scalability, flexibility, low cost and easy processing. However, despite of the remarkable progress, organic memory reliability, long term stability, ambient operation and large-area processing still need to be improved. Moreover, the rational device implementation lacks of a clear understanding of resistive switching mechanisms. In this work, high-performance cross-bar resistive memories based on a Parylene-C resistive layer sandwiched between silver electrodes are fabricated by means of large-area and high-throughput procedure. Parylene-C is a biocompatible, thermoplastic polymer, which can be deposited at room temperature. Memory elements show a reliable and reproducible switching behavior with low operating voltages, high ION/IOFF current ratio and record retention time in ambient conditions as well as high mechanical stability under bending conditions. The 3D molecular distribution of pristine and programmed devices is determined by state-of-the-art time-of-flight secondary ion mass spectrometer combined with an in-situ scanning probe microscopy (TOFSIMS/SPM). The depth profile analysis indicates that resistive switching is driven by the formation of few localized nanometer scale conductive filaments formed by the diffusion of silver and oxygen across the organic layer which are activated, locally interrupted and re-activated during the memory cycling. The SPM images allow separating surface morphology related effects from the 3D molecular analysis and to identify some typical artefacts in TOF-SIMS image reconstructions due to preferential sputtering.
LanguageEnglish
Pages209-215
Number of pages7
JournalOrganic Electronics: physics, materials, applications
Volume64
Early online date2018
DOIs
Publication statusE-pub ahead of print - 2018

Fingerprint

Data storage equipment
mass spectrometers
Silver
silver
electronics
Flexible electronics
Scanning probe microscopy
image reconstruction
Mechanical stability
secondary ion mass spectrometry
Mass spectrometers
Secondary ion mass spectrometry
Processing
artifacts
Image reconstruction
high voltages
filaments
flexibility
Thermoplastics
Surface morphology

Keywords

  • flexible organic memories
  • Parylene C
  • TOF-SIMS/SPM
  • resistive switching
  • Filamentary conduction
  • Flexible organic memories
  • Resistive switching

Cite this

Casula, Giulia ; Busby, Yan ; Franquet, Alexis ; Spampinato, Valentina ; Houssiau, Laurent ; Bonfiglio, Annalisa ; Cosseddu, Piero. / A flexible organic memory device with a clearly disclosed resistive switching mechanism. In: Organic Electronics: physics, materials, applications. 2019 ; Vol. 64. pp. 209-215.
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A flexible organic memory device with a clearly disclosed resistive switching mechanism. / Casula, Giulia; Busby, Yan; Franquet, Alexis; Spampinato, Valentina; Houssiau, Laurent; Bonfiglio, Annalisa; Cosseddu, Piero.

In: Organic Electronics: physics, materials, applications, Vol. 64, 01.01.2019, p. 209-215.

Research output: Contribution to journalArticle

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T1 - A flexible organic memory device with a clearly disclosed resistive switching mechanism

AU - Casula, Giulia

AU - Busby, Yan

AU - Franquet, Alexis

AU - Spampinato, Valentina

AU - Houssiau, Laurent

AU - Bonfiglio, Annalisa

AU - Cosseddu, Piero

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