A Gate-Tunable Adaptive Optoelectronic Synapse with Broadband Response for Neuromorphic Vision

Area of Science:

• Materials Science
• Neuroscience
• Optoelectronics

Background:

• Current optoelectronic synapses have limited spectral range and adaptation.
• Neuromorphic systems require devices with broad spectral sensitivity and dynamic adaptation.

Purpose of the Study:

• To develop a gate-tunable optoelectronic synapse with broadband spectral sensitivity and adaptive capabilities.
• To overcome limitations of existing optoelectronic synapses for neuromorphic applications.

Main Methods:

• Fabrication of a gate-tunable optoelectronic synapse using a 2D MoS2/GeSe van der Waals heterojunction.
• Characterization of the device's spectral response and synaptic plasticity emulation.
• Integration of the device into a neuromorphic visual system.

Main Results:

• The device exhibits continuous broadband spectral response from UV (295 nm) to NIR (830 nm).
• Demonstrated emulation of diverse synaptic plasticities and visual adaptation (scotopic/photopic) via gate-voltage modulation.
• Successful integration into a neuromorphic system for efficient image preprocessing and recognition.

Conclusions:

• The developed MoS2/GeSe optoelectronic synapse offers high performance and adaptive functionalities.
• This work presents a viable strategy for advanced neuromorphic visual perception systems.
• The device shows potential for intelligent visual processing applications.