Interface-modified unipolar resistive random access memory (RRAM) structure for low-power application.

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Resistive random access memory (RRAM) is a promising non-volatile memory technology.
• Improving the unipolar resistive-switching characteristics and uniformity of RRAM devices is crucial for practical applications.
• Transition metal oxides (TMOs) are widely studied as active materials in RRAM.

Purpose of the Study:

• To enhance the unipolar resistive-switching characteristics of RRAM devices.
• To investigate the effect of an interface-engineered bilayer structure using an AlOx insertion layer.
• To understand the mechanism behind uniformity improvement in RRAM.

Main Methods:

• Fabrication of an interface-engineered RRAM device with a bilayer TMO structure and an AlOx insertion layer.
• Experimental characterization of resistive switching behavior.
• Simulation using a random circuit breaker (RCB) model to analyze conducting-defect effects.

Main Results:

• The insertion of a thin AlOx layer between the Ir/NiO interface significantly improved resistive switching characteristics and uniformity.
• The AlOx insertion layer effectively reduced the conducting-defect ratio, leading to better filament path controllability.
• Optimal oxygen content in the AlOx insertion layer and TMO resulted in a notable reduction of reset current (I(RESET)) by up to 0.15 mA.

Conclusions:

• Interface engineering with an AlOx insertion layer is a viable strategy to enhance RRAM performance.
• The AlOx insertion layer plays a critical role in improving the forming and reset processes of RRAM.
• This approach offers a pathway for developing more reliable and efficient RRAM devices.