Ternary Resistance Switching Memory Behavior Based on Graphene Oxide Embedded in a Polystyrene Polymer Layer.

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Development of nonvolatile memory is crucial for advanced electronics.
• Ternary memory devices offer enhanced data storage capabilities.
• Graphene oxide (GO) shows promise in electronic applications due to its unique properties.

Purpose of the Study:

• To fabricate and characterize nonvolatile ternary memory devices.
• To investigate the performance of polystyrene (PS) and graphene oxide (GO) composites as active layers.
• To evaluate the stability and reliability of the fabricated memory devices.

Main Methods:

• Fabrication of indium tin oxide (ITO)/PS+GO/Al memory devices.
• Analysis of current-voltage (I-V) characteristics to determine conductivity states.
• Write-read-erase-read cycling tests to assess memory performance.
• High-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) for material analysis.

Main Results:

• The ITO/PS+GO/Al devices demonstrated current tri-stability with three distinct conductivity states.
• A stable intermediate conductivity state was reliably achieved under external voltage stimulus.
• The devices exhibited rewritable, nonvolatile ternary memory properties.
• Three conductivity states were maintained for an extended period of 2 × 10^5 seconds, indicating good stability.
• HRTEM and XPS confirmed a reaction between the aluminum (Al) top electrode and oxygen in GO.

Conclusions:

• Polystyrene (PS) and graphene oxide (GO) composites are effective active layers for nonvolatile ternary memory devices.
• The fabricated devices show promising rewritable, nonvolatile ternary memory characteristics with excellent stability.
• The observed Al-GO interaction may play a role in the device's memory mechanism.