2D Programmable Photodetectors Based on WSe₂/h-BN/Graphene Heterojunctions

Area of Science:

• Optoelectronics
• Materials Science
• Nanotechnology

Background:

• 2D materials offer unique electronic and optical properties for advanced device applications.
• Photodetectors are crucial components in optical communication systems.
• Programmable devices can enhance the flexibility and functionality of optoelectronics.

Purpose of the Study:

• To develop a programmable non-volatile bipolar semi-floating gate photovoltaic photodetector (SFG-PD).
• To utilize tungsten diselenide (WSe2), hexagonal boron nitride (h-BN), and graphene (Gra) for device construction.
• To demonstrate the device's capability in dual-channel optoelectronic hybrid communication.

Main Methods:

• Fabrication of a SFG-PD using WSe2, h-BN, and Gra layers.
• Application of voltage pulses to a control gate to modulate built-in electric fields.
• Characterization of the photodetector's response to light stimuli.
• Testing the device's performance in a dual-channel communication setup.

Main Results:

• The SFG-PD exhibits reversible switching between positive and negative light responses.
• The device achieves a rapid response time of up to 2.02 µs.
• Demonstrated successful application in dual-channel optoelectronic hybrid communication.

Conclusions:

• The developed programmable SFG-PD offers a versatile solution for optoelectronic applications.
• The device enables high-speed, large-capacity, low-loss, and secure multi-channel communication.
• This work paves the way for advanced communication technologies leveraging 2D materials.