Achieving adjustable digital-to-analog conversion in memristors with embedded Cs₂AgSbBr₆ nanoparticles.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Resistive switching (RS) memristors are crucial for next-generation electronics.
• Tuning material properties is key to controlling RS behavior (digital vs. analog).
• Lead-free halide perovskites offer a promising alternative for memristor applications.

Purpose of the Study:

• To investigate the effect of Cs2AgSbBr6 nanoparticle concentration on memristor device behavior.
• To achieve controllable digital and analog resistive switching in Ag/PMMA&Cs2AgSbBr6-NPs/ITO devices.
• To explore the potential of these devices for artificial synapse applications.

Main Methods:

• Fabrication of memristor devices with varying concentrations of Cs2AgSbBr6 nanoparticles (NPs) in a PMMA matrix.
• Electrical characterization to analyze resistive switching behaviors (digital and analog).
• Device simulation to understand the role of NPs in local electric fields and filament formation.

Main Results:

• Devices with 5 wt% Cs2AgSbBr6 NPs exhibited stable bipolar digital RS with high ON/OFF ratio (>500), low operating voltage, good endurance (>800 cycles), and retention (>10^4 s).
• Devices with 10 wt% Cs2AgSbBr6 NPs transitioned to analog-type memristive behavior.
• Successful simulation of artificial synapse behaviors using the analog switching regime.

Conclusions:

• Concentration-dependent tuning of Cs2AgSbBr6 NPs in PMMA enables control over digital and analog resistive switching.
• These lead-free halide perovskite-based memristors show potential for advanced applications like artificial synapses.
• The findings offer a pathway for developing novel memristive devices.