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Volatile Memristive Devices with Analog Resistance Switching Based on Self-Assembled Squaraine Microtubes as Synaptic
Karl Griffin1, Gareth Redmond1
1School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.
ACS Applied Materials & Interfaces
|January 4, 2024
Summary
New volatile memristive devices using squaraine microtubes demonstrate analog resistive switching and synaptic emulation. These organic devices show promising potential for neuromorphic computing applications.
Area of Science:
- Materials Science
- Organic Electronics
- Nanotechnology
Background:
- Memristive devices are crucial for next-generation computing, particularly for neuromorphic applications.
- Organic materials offer tunable properties for developing novel electronic devices.
- Squaraine (SQ) materials have shown potential in electronic applications due to their unique optical and electronic characteristics.
Purpose of the Study:
- To discover and characterize volatile memristive devices based on squaraine microtubes (MTs).
- To investigate the analog resistive switching (RS) behavior and synaptic emulation capabilities of these devices.
- To explore the potential of these organic devices for neuromorphic computing.
Main Methods:
- Preparation of squaraine microtubes (MTs) using evaporation-induced self-assembly (EISA).
- Fabrication of unipolar symmetric metal-insulator-metal (MIM) devices using EISA of MT meshes on interdigitated electrodes.
- Characterization of DC I-V characteristics, including pinched hysteretic loops, and analysis of transport mechanisms (Ohmic, SET, PF, F-N tunneling).
Main Results:
- Demonstrated memristive behavior with pinched hysteretic I-V loops in squaraine MT devices.
- Observed analog resistive switching behavior, including gradual conductance changes and distinct state writing/erasing.
- Successfully emulated advanced synaptic functions, such as excitatory postsynaptic current and various forms of plasticity, including volatile states mimicking forgetting.
Conclusions:
- Volatile memristive devices based on squaraine microtubes exhibit promising analog resistive switching and synaptic emulation capabilities.
- The observed behavior is attributed to purely electronic conduction mechanisms, including carrier trapping and detrapping.
- These findings highlight the potential of squaraine-based organic materials for developing efficient and functional neuromorphic computing hardware.
