Conductive-bridge memory cells based on a nanoporous electrodeposited GeSbTe alloy

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Resistance switching memory (RRAM) offers high density and low power consumption.
• GeSbTe (GST) materials are known for phase-change properties, but their use in RRAM requires further investigation.
• Fabricating reliable and cost-effective RRAM devices is crucial for next-generation electronics.

Purpose of the Study:

• To fabricate and characterize novel memory devices utilizing electrodeposited nanoporous GeSbTe (GST) layers.
• To investigate the distinct volatile and non-volatile resistance switching mechanisms in these devices.
• To explore the potential of these devices for flexible electronics and CMOS integration.

Main Methods:

• Fabrication of memory devices with TiN/nanoporous GST/Ag electrodes via electrodeposition.
• Electrical characterization to analyze resistance switching behavior under different preconditioning procedures.
• Physical analysis (e.g., TEM, EDS) to understand the switching mechanism and material changes after electrical stress.

Main Results:

• Successfully fabricated memory devices exhibiting both volatile and non-volatile resistance switching modes.
• Demonstrated that resistance switching is due to conductive filament formation/dissolution from the Ag electrode into the GST layer.
• Identified an interface layer between GST and Ag as the key factor for volatile/non-volatile switching behavior.

Conclusions:

• The developed GST-based memory devices offer tunable resistance switching characteristics.
• The simple, low-cost, and low-temperature fabrication process makes them suitable for flexible electronics.
• These devices show promise for integration into back-end-of-line CMOS technology.