Polarization-Sensitive Photodetectors Based on Anisotropic 2D Selenium and Its Multifunctional Applications

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Polarization-based communication and imaging are vital for next-gen multifunctional devices.
• Two-dimensional (2D) materials are promising for polarization detection due to thickness-dependent properties.
• Challenges include low power consumption, tunable sensitivity, and broadband response in current devices.

Purpose of the Study:

• To develop high-performance polarization-sensitive photodetectors with enhanced characteristics.
• To investigate the potential of 2D selenium (Se) for these applications.
• To demonstrate practical applications in polarized light communication and imaging.

Main Methods:

• Fabrication of photodetectors utilizing 2D selenium (Se).
• Characterization of device performance, including polarization ratio, dark current, and response time.
• Evaluation of air stability and modulation by gate voltage and power density.

Main Results:

• Achieved a high polarization ratio of 3.09.
• Demonstrated ultralow dark current (∼10^-12 A) and fast response time (∼3 ms).
• Exhibited excellent air stability (>2 months) and tunable photoresponse.

Conclusions:

• 2D Se photodetectors offer a promising pathway for high-performance, multifunctional optoelectronic devices.
• The intrinsic anisotropic structure of 2D Se enables effective polarization sensitivity.
• Demonstrated feasibility for polarized light-encrypted communication and polarization imaging.