High-Performance Polarization-Sensitive Photodetector Based on ReS₂/MoWSe₂ van der Waals Heterostructure

Area of Science:

• Materials Science
• Condensed Matter Physics
• Optoelectronics

Background:

• Anisotropic two-dimensional (2D) materials are promising for polarized light detection due to their polarization sensitivity.
• Single-material photodetectors face challenges like limited responsivity, narrow spectral range, and high noise.

Purpose of the Study:

• To engineer a high-performance photodetector utilizing a van der Waals heterostructure.
• To leverage the combined properties of ReS₂ and MoWSe₂ for enhanced polarization-sensitive photodetection.

Main Methods:

• Fabrication of a van der Waals heterostructure device using anisotropic ReS₂ and ternary MoWSe₂ alloy.
• Characterization of the photodetector's performance, including detectivity, polarization ratio, spectral response, and responsivity under varying bias conditions.

Main Results:

• Achieved high detectivity (3.78 × 10¹⁴ Jones) and a polarization ratio of 11.3 under low bias.
• Demonstrated broadband detection from visible (405 nm) to near-infrared (1064 nm) spectrum.
• Observed a responsivity of 23.22 A/W under forward bias, indicating a transition to a photoconductive regime.

Conclusions:

• The ReS₂/MoWSe₂ heterostructure offers a versatile and scalable platform for advanced optoelectronic applications.
• The device exhibits excellent performance for low-noise, broadband, and polarization-resolved photodetection.
• This work paves the way for next-generation polarization-sensitive photodetectors.