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A long-wavelength infrared (IR) photodetector based on two-dimensionalmaterials working at room temperature would have wide applications in manyaspects in remote sensing, thermal imaging, biomedical optics, and medicalimaging. However, sub-bandgap light detection in graphene and black phosphorushas been a long-standing scientific challenge because of low photoresponsivity,instability in the air and highdark current. In this study, we report a highlysensitive, air-stable and operable long-wavelength infrared photodetector atroom temperature based on PdSe2 phototransistors and its heterostructure. Ahigh photoresponsivity of ~42.1 AW-1 (at 10.6 {\mu}m) was demonstrated, whichis an order of magnitude higher than the current record of platinum diselenide.Moreover, the dark current and noise power density were suppressed effectivelyby fabricating a van der Waals heterostructure. This work fundamentallycontributes to establishing long-wavelength infrared detection by PdSe2 at theforefront of long-IR two-dimensional-materials-based photonics.

Palladium Diselenide Long-Wavelength Infrared Photodetector with High Sensitivity and Stability