Self-Compliant Bipolar Resistive Switching in SiN-Based Resistive Switching Memory.

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Resistive switching random-access memory (RRAM) is a promising non-volatile memory technology.
• Achieving reliable self-compliance and self-rectification is crucial for RRAM device performance and scalability.
• Tuning the properties of the electrodes and dielectric layers is key to controlling resistive switching behavior.

Purpose of the Study:

• To investigate the self-compliant and self-rectifying bipolar resistive switching behavior in Ni/SiN/n⁺ Si and Ni/SiN/n⁺⁺ Si devices.
• To explore the impact of silicon bottom electrode doping concentration on resistive switching characteristics.
• To demonstrate the potential for optimized RRAM device performance through controlled doping.

Main Methods:

• Fabrication of Ni/SiN/n⁺ Si and Ni/SiN/n⁺⁺ Si devices with varying silicon bottom electrode doping levels.
• Electrical characterization of the devices to analyze resistive switching behavior, including current-voltage (I-V) measurements.
• Analysis of the influence of dopant concentration on switching mechanisms, current overshoot, and self-rectification.

Main Results:

• Demonstrated self-compliant and self-rectifying bipolar resistive switching in both device types.
• Observed unipolar and bipolar switching in the higher doped Ni/SiN/n⁺⁺ Si device due to current overshoot.
• Achieved self-rectification and self-compliance in the lower doped Ni/SiN/n⁺ Si device attributed to the silicon bottom electrode's series resistance.

Conclusions:

• Silicon bottom electrode doping concentration significantly influences resistive switching behavior in Ni/SiN/Si RRAM devices.
• Lower doping concentrations in the silicon bottom electrode are effective in achieving self-rectification and self-compliance.
• These findings offer a pathway for designing high-performance RRAM devices with inherent control mechanisms.