Electron Trapping Enhanced Deep-Ultraviolet Optoelectronic Synapses Based on Two-Dimensional Wide-Bandgap...

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Deep-ultraviolet (DUV) optoelectronic synapses (OSPs) are crucial for next-generation biometric recognition.
• Existing inorganic wide-bandgap (WB) semiconductor devices face performance challenges.

Purpose of the Study:

• To develop low-temperature, solution-processable DUV OSPs.
• To enhance synaptic performance and energy efficiency.
• To apply DUV OSPs in biometric recognition systems.

Main Methods:

• Fabrication of DUV OSPs using 2D WB perovskite/organic semiconductor vertical heterojunctions.
• Utilizing an electron trapping effect for spatial separation of photoexcited carriers.
• Characterization of synaptic properties and power consumption.

Main Results:

• Achieved significantly enhanced persistent optoelectronic conductivity.
• Demonstrated outstanding synaptic properties with improved short- to long-term memory.
• Exhibited ultra-low power consumption (28.7 fJ per event), comparable to biological synapses.
• Attained 96.7% accuracy in a DUV fingerprint recognition system.

Conclusions:

• The developed DUV OSPs offer high performance and low power consumption.
• The electron trapping mechanism is effective for enhancing synaptic behavior.
• These findings support the development of cost-effective DUV OSPs for biometric applications.