PdSe<sub>2</sub>/2H–MoTe<sub>2</sub> Heterojunction Self-Powered Photodetector: Broadband Photodetection and Linear/Circular Polarization Capability
Mengqi Che, Bin Wang, Xingyu Zhao, Yahui Li, Chunlu Chang, Mingxiu Liu, Yu Du, Liujian Qi, Nan Zhang, Yuting Zou, Shaojuan Li
Abstract
In this research, we introduce a PdSe 2 /2H–MoTe 2 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 × 10 3 A/W and a substantial specific detectivity of 8.5 × 10 12 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 PdSe 2 /2H–MoTe 2 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 × 10 10 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 PdSe 2 /2H–MoTe 2 heterojunction provides a powerful solution for near-infrared full-Stokes polarization detectors with high integration, miniaturization, and portability.