PdSe₂/2H–MoTe₂ Heterojunction Self-Powered Photodetector: Broadband Photodetection and Linear/Circular Polarization Capability

Abstract

In this research, we introduce a PdSe₂/2H-MoTe₂ heterojunction photodetector that exhibits both broadband self-powered photodetection and linear/circular polarization detection capabilities. It has a broad spectral response range (covering 375-2200 nm) and reaches a peak sensitivity at 532 nm, exhibiting a notable responsivity of 7.3 × 10³ A/W and a substantial specific detectivity of 8.5 × 10¹² Jones. Even in the near-infrared region of 1310 nm, it still has a high responsivity of 20 A/W. The self-powered photodetection capabilities of the PdSe₂/2H-MoTe₂ heterojunction are equally impressive, covering a broad range from 375 to 1550 nm, with a responsivity of 243 mA/W, a specific detectivity of 6.46 × 10¹⁰ Jones, a fill factor of 0.8, and an external quantum efficiency of 56.73%. Finally, simultaneous implementation of linear/circular polarization detection on the PdSe₂/2H-MoTe₂ heterojunction provides a powerful solution for near-infrared full-Stokes polarization detectors with high integration, miniaturization, and portability.