Nanoporous silicon oxide memory.

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Oxide-based two-terminal resistive random access memory (RRAM) is a leading technology for future nonvolatile memory.
• Existing RRAM technologies face challenges in fabrication and performance.

Purpose of the Study:

• To introduce a new RRAM memory structure utilizing nanoporous (NP) silicon oxide (SiOx).
• To demonstrate unipolar switching capabilities enabled by an internal vertical nanogap in NP SiOx.
• To evaluate the performance metrics of this novel RRAM device.

Main Methods:

• Fabrication of RRAM devices using nanoporous silicon oxide (SiOx) material.
• Characterization of device performance, including electroforming voltage, ON-OFF ratio, endurance, switching speed, and power consumption.
• Assessment of high-temperature lifetime and room temperature processability.

Main Results:

• The NP SiOx RRAM exhibited unipolar switching with a low electroforming voltage of approximately 1.6 V.
• Outstanding performance metrics were achieved: multibit storage (up to 9-bits), high ON-OFF ratio (up to 10^7 A), long high-temperature lifetime (≥ 10^4 s at 100 °C), excellent cycling endurance (≥ 10^5), sub-50 ns switching speeds, and low power consumption (approx. 6 × 10^-5 W/bit).
• The memory demonstrated room temperature processability and did not require compliance current during operation.

Conclusions:

• The developed NP SiOx RRAM offers a promising pathway for easily accessible nonvolatile memory applications.
• The device's superior performance metrics and fabrication advantages make it a strong candidate for next-generation memory technologies.
• The unique internal vertical nanogap structure is key to enabling efficient unipolar switching and high performance.