Self-compliance RRAM characteristics using a novel W/TaO x /TiN structure

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Resistive Random Access Memory (RRAM) offers promising non-volatile memory solutions.
• Achieving self-compliance behavior is crucial for reliable RRAM operation.
• Tantalum oxide (TaOx) is a key material in RRAM device fabrication.

Purpose of the Study:

• To investigate the self-compliance characteristics of a novel W/TaOx/TiN RRAM structure.
• To analyze the impact of material interfaces and device dimensions on RRAM performance.
• To elucidate the switching mechanism responsible for the observed resistive switching.

Main Methods:

• Fabrication of W/TaOx/TiN memory devices.
• High-resolution transmission electron microscopy (HRTEM) for structural analysis.
• Electrical characterization including switching cycles, endurance, and data retention tests.

Main Results:

• Demonstrated self-compliance resistive switching with excellent uniformity (>100 cycles, device-to-device).
• Achieved program/erase endurance exceeding 10^3 cycles and read endurance over 10^6 cycles.
• Identified oxygen vacancy migration in TaOx as the primary switching mechanism, with good data retention (>10^4 s).

Conclusions:

• The W/TaOx/TiN structure successfully exhibits self-compliance RRAM characteristics.
• Device performance is influenced by electrode dimensions and interface properties.
• The findings pave the way for developing reliable and efficient RRAM devices.