Electronic/Optoelectronic Memory Device Enabled by Tellurium-based 2D van der Waals Heterostructure for in-Sensor...

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) materials are extensively researched for data storage and neuromorphic computing applications.
• Developing 2D material-based memory devices with optoelectronic responsivity in the short-wave infrared (SWIR) region for in-sensor reservoir computing (RC) at optical communication bands presents a significant challenge.

Purpose of the Study:

• To engineer a 2D material-based memory device with optoelectronic responsivity in the SWIR region.
• To demonstrate an in-sensor reservoir computing system capable of processing optical communication signals.

Main Methods:

• Fabrication of a van der Waals (vdW) heterostructure device using ferroelectric CuInP2S6 and a tellurium channel.
• Characterization of the device's memory behaviors, including long-term potentiation/depression via electrical pulses and short-term potentiation via 1550 nm laser pulses.
• Implementation of a fully memristive in-sensor RC system for simultaneous sensing, decoding, and learning of optical fiber transmitted messages.

Main Results:

• The fabricated tellurium-based 2D vdW heterostructure device exhibits both long-term and short-term memory functionalities.
• The device demonstrates optoelectronic responsivity in the SWIR region, specifically at 1550 nm, a key wavelength for optical communications.
• A functional in-sensor RC system was successfully demonstrated, capable of processing optical signals directly within the memory device.

Conclusions:

• The developed 2D vdW heterostructure memory device successfully integrates long-term and short-term memory behaviors using electrical and optical stimuli in the SWIR region.
• This work expands the application scope of 2D materials in optoelectronics and paves the way for advanced edge computing systems.
• The device offers a promising platform for future smart signal processing systems, particularly for optical communication applications.