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Types of Reversible Electrodes01:24

Types of Reversible Electrodes

For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...

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Flexible organic memory devices with multilayer graphene electrodes.

Yongsung Ji1, Sangchul Lee, Byungjin Cho

  • 1School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea.

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Summary

Flexible organic resistive memory devices using multilayer graphene electrodes exhibit write-once-read-many (WORM) characteristics. These devices maintain stable performance under bending, demonstrating excellent uniformity and a high ON/OFF ratio.

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Area of Science:

  • Organic electronics
  • Materials science
  • Device physics

Background:

  • Flexible electronics require robust and transparent conductive materials.
  • Organic resistive memory offers potential for low-cost, large-area applications.
  • Transparent electrodes are crucial for integrated optoelectronic devices.

Purpose of the Study:

  • To fabricate and characterize flexible organic resistive memory devices.
  • To evaluate the performance of multilayer graphene (MLG) as transparent electrodes.
  • To assess the stability and uniformity of these devices under mechanical stress.

Main Methods:

  • Fabrication of 8x8 cross-bar array flexible organic resistive memory devices.
  • Utilized polyimide and 6-phenyl-C61 butyric acid methyl ester composite as the active layer.
  • Employed transparent multilayer graphene (MLG) electrodes on a poly(ethylene terephthalate) substrate.

Main Results:

  • Achieved devices with typical write-once-read-many (WORM) characteristics.
  • Demonstrated a high ON/OFF ratio exceeding 10^6.
  • MLG electrodes exhibited sheet resistance of ~270 Ω/◻ and ~92% transmittance.
  • Showcased excellent cell-to-cell uniformity and stability under repeated bending (up to 10,000 cycles).
  • Observed a retention time exceeding 10^4 s without fluctuation during bending.

Conclusions:

  • Flexible WORM memory devices with MLG electrodes show promising performance.
  • The devices exhibit excellent mechanical stability and uniformity, suitable for flexible electronic applications.
  • MLG is a viable transparent electrode material for high-performance flexible organic memory.