Palladium Diselenide Long-Wavelength Infrared Photodetector with High Sensitivity and Stability.
basic_science · Level V
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- Record sourced from PubMed, PMID 30714726.
- Also identified by DOI 10.1021/acsnano.8b09476.
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Abstract
A long-wavelength infrared photodetector based on two-dimensional materials working at room temperature would have wide applications in many aspects in remote sensing, thermal imaging, biomedical optics, and medical imaging. However, sub-bandgap light detection in graphene and black phosphorus has been a long-standing scientific challenge because of their low photoresponsivity, instability in the air, and high dark current. In this study, we report a highly sensitive, air-stable, and operable long-wavelength infrared photodetector at room temperature based on PdSe<sub>2</sub> phototransistors and their heterostructure. A high photoresponsivity of ∼42.1 AW<sup>-1</sup> (at 10.6 μm) was demonstrated, which is an order of magnitude higher than the current record of platinum diselenide. Moreover, the dark current and noise power density were suppressed effectively by fabricating a van der Waals heterostructure. This work fundamentally contributes to establishing long-wavelength infrared detection by PdSe<sub>2</sub> at the forefront of long-IR two-dimensional-materials-based photonics.