Highly Stable, Low-Energy-Consumption Block Copolymer Optoelectronic Synaptic Devices Prepared by Vertical Phase...

Area of Science:

• Materials Science
• Organic Electronics
• Bionic Systems

Background:

• Environmental stability is crucial for organic synaptic devices in smart electronics.
• Organic semiconductors' sensitivity to moisture and oxygen hinders air-stable device fabrication.

Purpose of the Study:

• To develop air-stable organic synaptic devices using a novel material blend.
• To demonstrate the potential of these devices in bionic electronics.

Main Methods:

• Blending poly(3-hexylthiophene)-block-poly(phenyl isocyanide) with pentafluorophenyl ester (P3HT-b-PPI(5F)) and poly(methyl methacrylate) (PMMA).
• Utilizing vertical phase separation for one-step preparation of active and encapsulated layers.
• Simulating synaptic behavior, filtering, and decoding under green light stimulation.

Main Results:

• The P3HT-b-PPI(5F)/PMMA synaptic device exhibited high air stability, retaining over 90% of its postsynaptic current after 2 weeks.
• Successfully simulated basic synaptic behavior, high-pass filtering, and optical decoding of "Morse code".
• Achieved low energy consumption (0.6 fJ per event) and demonstrated biomimetic learning and forgetting behaviors.

Conclusions:

• A novel method for preparing air-stable organic synaptic devices was demonstrated.
• The developed devices show promise for future bionic electronic applications.
• The P3HT-b-PPI(5F)/PMMA blend offers a viable route to stable and functional organic synaptic devices.