Gate-Tunable Te-WSe₂ Heterojunction Diodes for Polarization Detection and Logic Operation Application

Area of Science:

• Optoelectronics
• Materials Science
• Nanotechnology

Background:

• Integrating optical sensing and computing in single devices is crucial for next-gen optoelectronics.
• 2D van der Waals heterostructures (vdWHs) present a promising platform for multifunctional devices.
• Material limitations and complex architectures pose significant challenges.

Purpose of the Study:

• To demonstrate a gate-tunable Te-WSe2 heterojunction device for simultaneous photodetection and optoelectronic logic.
• To exploit in-plane anisotropy and gate-tunable band alignment for enhanced performance.
• To showcase applications in secure optical communication and multimode logic gates.

Main Methods:

• Fabrication of a Te-WSe2 heterojunction device.
• Utilizing in-plane anisotropy of Te and gate-tunable band alignment.
• Characterization of photodetection (responsivity, detectivity, response time) and polarization sensitivity.
• Demonstration of reconfigurable optoelectronic logic operations.

Main Results:

• Achieved a widely adjustable rectification ratio > 10^5.
• Demonstrated high responsivity (667.9 mA W^-1) and specific detectivity > 10^11 Jones.
• Exhibited gate-tunable polarization anisotropy ratio (AR) from 1.27 to 17.8.
• Showcased a fast response time of ~25 µs.
• Successfully implemented secure optical communication and multimode logic gates.

Conclusions:

• The Te-WSe2 heterojunction overcomes key limitations in polarization photodetection.
• The device offers a pathway towards compact, intelligent optoelectronic systems.
• This work enables advanced information processing through integrated sensing and computing.