Kinetic factors determining conducting filament formation in solid polymer electrolyte based planar devices

Area of Science:

• Materials Science
• Solid-state Physics
• Electrochemistry

Background:

• Atomic switches are crucial for next-generation electronics.
• Solid polymer electrolytes (SPEs) offer advantages in device fabrication and flexibility.
• Understanding filament formation dynamics is key to improving switch performance.

Purpose of the Study:

• To investigate resistive switching and filament formation in SPE-based planar atomic switches.
• To optimize device configuration and experimental parameters for enhanced switch performance.
• To elucidate the influence of kinetic factors on filament growth morphology.

Main Methods:

• Fabrication of planar-type atomic switches using SPE with active Ag and inert Pt electrodes.
• Optimization of gap distance, salt inclusion in the polymer matrix, and compliance current.
• In-situ observation of filament formation using scanning electron microscopy (SEM).
• Analysis of current-voltage (I-V) characteristics to understand switching behavior.

Main Results:

• High ionic conductivity of SPE facilitated SEM observation of filament formation.
• Switching behavior and filament morphology are strongly dependent on kinetic factors.
• Identified key factors: redox reaction rate, ion mobility, electric field, and reduction sites.
• Demonstrated control over filament formation (unidirectional vs. dendritic growth) by tuning parameters.

Conclusions:

• Optimizing SPE-based atomic switches requires careful control of kinetic factors influencing filament formation.
• Tuning device parameters allows for tailored filament growth, improving stability and performance.
• This research provides insights into the fundamental mechanisms governing resistive switching in SPE devices.