Multicolor Fully Light-Modulated Artificial Synapse Based on P-MoSe₂/PO Heterostructured Memristor

Area of Science:

• Materials Science
• Neuroscience
• Electrical Engineering

Background:

• The von Neumann bottleneck hinders computational efficiency in traditional architectures.
• Optoelectronic memristive devices show promise for artificial synapses, but full light modulation, especially with near-infrared light, is challenging.
• Developing brain-inspired neuromorphic paradigms is crucial for next-generation computing.

Purpose of the Study:

• To develop a fully light-modulated synaptic memristor capable of emulating synaptic functionality.
• To investigate multiwavelength (visible to near-infrared) light modulation of synaptic behaviors.
• To explore the potential of such devices in artificial visual systems and complex information processing.

Main Methods:

• Fabrication of a P-MoSe2/PO heterostructure via a one-step selenization process.
• Characterization of multiwavelength light-modulated switching operations and synaptic behaviors (PSC, PFF, STM, LTM).
• Investigation of light-induced switching mechanisms and demonstration of Pavlovian conditioning.

Main Results:

• Achieved multiwavelength (470 nm to 808 nm) modulated switching operations with reset voltages from 0.21-0.97 V.
• Demonstrated diverse synaptic behaviors including postsynaptic current (PSC), paired-pulse facilitation, short-term memory (STM), and long-term memory (LTM).
• Observed light intensity-dependent PSC modulation and tunable STM-to-LTM transitions, along with Pavlovian conditioning.

Conclusions:

• The P-MoSe2/PO heterostructure enables fully light-modulated artificial synaptic function across a wide spectrum.
• The device exhibits brain-like memory behaviors and processing capabilities, suitable for complex input processing.
• This work presents a pathway towards multiwavelength modulated artificial visual systems for applications like color recognition.