Multiwavelength-Responsive Plasticity in a Bias-Free Perovskite Synaptic Device for Neuromorphic Vision

Area of Science:

• Materials Science
• Neuroscience
• Optoelectronics

Background:

• Neuromorphic vision systems require low-power, color-sensitive components.
• Existing synaptic devices often lack color sensitivity or use toxic materials.

Purpose of the Study:

• To develop a lead-free, color-sensitive synaptic device inspired by coral.
• To investigate wavelength-dependent synaptic plasticity for neuromorphic applications.

Main Methods:

• Fabrication of a Cs3Bi2Br9 perovskite nanocrystal film using centrifugal casting.
• Characterization of wavelength-dependent plasticity under varying light conditions (405, 520, 635 nm).
• Analysis of bromine vacancies' role in carrier transport and plasticity.

Main Results:

• The device demonstrated tunable short-term and long-term synaptic plasticity without external bias.
• Wavelength and intensity modulation achieved excitatory, inhibitory, and saturating biological responses.
• Bromine vacancies were identified as key to plasticity modulation.

Conclusions:

• The coral-inspired perovskite synaptic device offers a novel approach for color-sensitive neuromorphic vision.
• Efficient RGB visual information preprocessing enhances artificial neural network recognition accuracy.
• This technology shows significant promise for advancing neuromorphic systems.