Ultralow Set Voltage and Enhanced Switching Reliability for Resistive Random-Access Memory Enabled by an...

Area of Science:

• Materials Science and Engineering
• Nanotechnology
• Solid-State Electronics

Background:

• Resistive random-access memory (RRAM) offers advantages like scalability and speed but faces reliability challenges due to random ion movement.
• Improving memristor performance and reliability requires precise control over internal ionic processes.

Purpose of the Study:

• To develop a novel memristor structure that enhances control over ionic migration for improved RRAM performance and reliability.
• To investigate the impact of a Ni nanocone array on the conductive filament formation and dissolution in an Ag/Al2O3/Pt device.

Main Methods:

• Fabrication of a Ni nanocone array using electrodeposition.
• Integration of the Ni nanocone array into an Ag/Al2O3/Pt resistive switching device.
• Characterization using finite element analysis, transmission electron microscopy, and current mapping tests.

Main Results:

• The nanocone-array-based memristor demonstrated superior switching performance with ultralow set voltage (-0.37 V).
• Achieved concentrated voltage/resistance distribution (CV 14.8%/32.7%) and robust endurance (>10^5 cycles).
• Demonstrated multilevel storage capability and predictable conductive filament formation/dissolution.

Conclusions:

• The Ni nanocone array effectively confines ionic migration, leading to predictable conductive filament behavior.
• This approach offers a reliable method for controlling conductive filament growth in RRAM devices.
• The developed RRAM device shows significant potential for advancing memristor technology.