Spectrally Defined Bipolar Black Phosphorus Memristor Enables All-Optical Boolean Logic and Multispectral Computing.

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Optoelectronic memristors are crucial for in-sensor vision-centric neuromorphic hardware.
• Achieving wavelength-defined polarity inversion across a broad spectrum is a significant challenge.

Purpose of the Study:

• To demonstrate a stable optoelectronic memristor with programmable polar photoresponses.
• To explore its capabilities in all-optical Boolean logic operations and multispectral computing.

Main Methods:

• Fabrication of a heterostructure memristor using nonstoichiometric lead oxide (PbOₓ) coated black phosphorus (BP) nanosheets.
• Investigating optoelectronic processes across a broad wavelength range (365 nm - 1,550 nm).
• Utilizing photoelectrochemical and photothermal effects for polarity control.

Main Results:

• Programmable polar photoresponses achieved across the 365 nm - 1,550 nm spectrum.
• Demonstrated all-optical Boolean logic operations, realizing 14 binary functions.
• Achieved high classification accuracy (up to 98.6%) for crop species using an all-optical convolutional neural network.

Conclusions:

• The PbOₓ-BP heterostructure enables effective surface modification for 2D devices.
• The demonstrated optoelectronic bipolarity provides a framework for all-optical modulation in neuromorphic machine vision.
• This work advances the development of advanced optoelectronic devices for future computing applications.