高灵敏度和稳定性的二硒化钯长波红外探测器
Palladium Diselenide Long-Wavelength Infrared Photodetector with High Sensitivity and Stability
摘要：
基于二维材料的室温长波红外探测器在遥感、热成像、生物医学光学和医学成像等领域有着广泛的应用前景。然而，石墨烯和黑磷中的亚带隙光探测一直是一个长期存在的科学挑战，因为光响应度低，在空气中不稳定和高暗电流。在这项研究中，我们报告了一个高灵敏度，空气稳定和可操作的长波红外探测器在室温下的PdSe 2光电晶体管及其异质结的基础上。在10.6 μm波长下，其光响应率高达~ 42.1AW-1，比目前铂二硒化物的光响应率高出一个数量级。此外，通过制作范德华异质结，可以有效地抑制暗电流和噪声功率密度。这项工作从根本上有助于在基于长红外二维材料的光子学的最前沿建立PdSe 2的长波长红外探测。
英文摘要：
A long-wavelength infrared (IR) 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 low photoresponsivity, instability in the air and highdark current. In this study, we report a highly sensitive, air-stable and operable long-wavelength infrared photodetector at room temperature based on PdSe2 phototransistors and its heterostructure. A high photoresponsivity of ~42.1 AW-1 (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 PdSe2 at the forefront of long-IR two-dimensional-materials-based photonics.
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