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Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes
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Sprayed FeWO4 thin film-based memristive device with negative differential resistance effect for non-volatile memory
Amitkumar R Patil1, Tukaram D Dongale2, Lahu D Namade1
1Electrochemical Materials Laboratory, Department of Physics, Shivaji University, Kolhapur 416004, India.
Journal of Colloid and Interface Science
|April 7, 2023
Summary
Iron tungstate (FeWO4) thin films were fabricated for memristive devices, demonstrating stable resistive switching and synaptic functionalities. This low-cost method offers promising solutions for next-generation non-volatile memories and computing.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Resistive switching (RS) memories are crucial for next-generation non-volatile memory and computing due to their simple structure, high performance, and low power consumption.
- Iron tungstate (FeWO4) is explored as a potential switching layer material for memristive devices.
Purpose of the Study:
- To synthesize uniform iron tungstate (FeWO4) thin films using spray pyrolysis.
- To fabricate and characterize Ag/FWO/FTO memristive devices for resistive switching applications.
- To investigate the device's potential for neuromorphic computing by mimicking synaptic behaviors.
Main Methods:
- Spray pyrolysis method for FeWO4 thin film deposition.
- Structural and morphological characterization using XRD, Raman spectroscopy, and XPS.
- Electrical characterization of Ag/FWO/FTO devices for RS properties, endurance, retention, and synaptic functions.
- Time series analysis (Holt's Winter Exponential Smoothing) for switching voltage modeling.
Main Results:
- Pure and single-phase FeWO4 thin films with spherical nanoparticles (20-40 nm) were successfully synthesized.
- Ag/FWO/FTO devices exhibited non-volatile resistive switching with good endurance, retention, and reproducible negative differential resistance (NDR) effects.
- The devices demonstrated bio-synaptic functionalities including potentiation/depression, EPSC, and STDP learning rules.
- Space-charge-limited current (SCLC) and trap-controlled SCLC mechanisms explained the I-V characteristics, with RS dominated by conductive filament formation/rupture.
Conclusions:
- Spray pyrolysis is a viable low-cost method for fabricating FeWO4-based memristive devices.
- The synthesized FeWO4 thin films show excellent potential for non-volatile memory and neuromorphic computing applications.
- The study highlights the versatility of metal tungstate materials in advanced electronic devices.
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