Low-operation voltage conductive-bridge random access memory based on amorphous NbS₂

Area of Science:

• Materials Science
• Solid-State Electronics
• Nanotechnology

Background:

• Resistive switching (RS) memory devices offer high density and low power consumption.
• Conductive-bridge random-access memory (CBRAM) utilizes filament formation and rupture for switching.
• Developing novel materials for RS layers is crucial for advancing memory technology.

Purpose of the Study:

• To investigate amorphous niobium disulfide (NbS2) as a potential resistive switching layer for CBRAM.
• To evaluate the electrical characteristics and stability of NbS2-based CBRAM devices.
• To elucidate the resistive switching mechanism in amorphous NbS2.

Main Methods:

• Fabrication of amorphous NbS2 films at room temperature.
• Integration of NbS2 as the RS layer with Cu and Au electrodes for CBRAM devices.
• Characterization of resistive switching behavior, including voltage sweeps and endurance tests.
• Analysis of current-voltage characteristics to determine the switching mechanism.

Main Results:

• Amorphous NbS2 films exhibited excellent thermal stability, resisting crystallization up to 500°C.
• NbS2-based CBRAM devices demonstrated stable bipolar non-volatile resistive switching.
• Low operating voltages (< 1V) and a high on-off ratio (>100) were achieved.
• Concentrated high and low resistance states indicate reliable data storage.

Conclusions:

• Amorphous NbS2 is a promising material for developing low-operation voltage CBRAM.
• The formation and rupture of Cu conductive filaments are identified as the RS mechanism.
• NbS2-based CBRAMs offer a viable pathway for next-generation memory applications.