Investigation of Resistive Switching in Cu/a-SiC/P⁺-Si Structure for Multilevel Nonvolatile Memory Applications

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Resistive switching (RS) memory devices offer promising alternatives to conventional memory technologies.
• Multilevel nonvolatile memory is crucial for high-density data storage.
• Conducting filament formation is a key mechanism in many RS devices.

Purpose of the Study:

• To investigate the resistive switching characteristics of a Cu/a-SiC/P+-Si device.
• To explore the potential of this structure for multilevel nonvolatile memory applications.
• To understand the role of conducting filament formation in the switching mechanism.

Main Methods:

• Fabrication of a Cu/a-SiC/P+-Si sandwiched structure.
• Systematic investigation of resistive switching behavior.
• Temperature-dependent testing to elucidate the switching mechanism.
• Modulation of compliance current to achieve multiple resistance states.

Main Results:

• Achieved four distinct resistance states in the Cu/a-SiC/P+-Si memory device.
• Identified copper conducting filament formation as the switching mechanism.
• Demonstrated reliable data retention of approximately 10^5 seconds at temperatures up to 85 °C.
• Showed that higher compliance current during the Set process leads to more conductive filaments.

Conclusions:

• The Cu/a-SiC/P+-Si device exhibits promising multilevel resistive switching characteristics.
• The device shows potential for high-density RRAM applications due to its reliable retention and multilevel capability.
• Understanding filament formation is key to optimizing device performance.