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

Abstract

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 high dark 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 2 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.KEYWORDS: photodetector, long-wavelength infrared, photoresponsivity, palladium diselenide, detectivity, heterostructure Scalable two-dimensional, long-wavelength infrared photodetectors operating at room temperature are highly desirable for upcoming remote sensing, thermal imaging, biomedical optics, medical imaging, and space communication applications.State-of-the-art long-wavelength infrared (LWIR) photodetectors based on narrow-bandgap semiconductors using HgCdTe alloy and III-V compound quantum structures suffer from several major challenges, such as the need for operation at liquid nitrogen temperatures, the complexity of sample synthesis and challenging device fabrication processes. 1 Commercial widely used LWIR photodetectors with 5-20 nm wavelength operating at room temperature based on VOx and α-Si possess many advantages such as compatibility with mass production, low price, and facile fabrication processes. However, their low sensitivity, short detection wavelength range and low response speed restrict their application. 2 Recently, the discovery of graphene, a two-dimensional layered material, has offered an opportunity to overcome some of these issues. In previous studies, LWIR photodetectors based on a graphene nanoribbon, 3 graphene quantum dot-like arrays 4 and a graphene heterostructure 5 have been demonstrated. Generally, the photoresponsivity has been low, approximately 7.5 μA W -1 in the graphene nanoribbon, due to the limited light absorption of 2.3% in an atomic thin layer, 6 and a high dark current due to the gapless band structure. Although strategies such as surface plasma enhanced light absorption 7 and carrier multiplication [8][9][10] have been adopted to enhance the photoresponsivity of graphene photodetectors, the photoresponsivity is still relatively low at several tens of mA W -1 .A photoresponsivity of up to 0.4 AW -1 at 10.6 μm was demonstrated by etching graphene to form quantum-dot-like arrays. 4 The resulting high responsivity was 16 ...

Large‐Scale Ultrathin 2D Wide‐Bandgap BiOBr Nanoflakes for Gate‐Controlled Deep‐Ultraviolet Phototransistors

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Zweidimensionale Edelmetallchalkogenide und ‐phosphochalkogenide

“…Die optischen Eigenschaften von PdSe 2 machen es vorteilhaft für Sensoranwendungen und Photokatalyse . Long et al . stellten einen hochempfindlichen, luftstabilen, langwelligen Infrarot‐Photodetektor basierend auf einer MoS 2 /PdSe 2‐ Heteroverbindung her, welcher hohe Photoresponsivitäten von 42.1 A W −1 bei 10.6 μm aufweist.…”

“…NMDCs haben viel Aufmerksamkeit als neue Mitglieder der Familie von 2D‐Materialien erhalten, weil diese einen kontrollierbaren Metall‐zu‐Halbleiter‐Übergang mit der Lagenanzahl aufweisen, wobei dünne Schichten und das Bulk‐Material topologische Eigenschaften als Dirac‐Typ‐II‐Halbmetall besitzen . Die NMDCs zeigen eine herausragende Leistung als Sensoren, zum Beispiel für Druck oder bestimmte molekulare Spezies . Ihre Chemie, die sehr anisotrope strukturelle Merkmale, geringe Energiebarrieren zwischen den Strukturtypen, kontrollierbare Phasenübergänge und katalytische Eigenschaften beinhaltet, unterscheidet sich von den Übergangsmetalldichalkogeniden (TMDCs) wie MoS 2 oder WSe 2 .…”