Ultrasensitive Solar‐Blind Ultraviolet Photodetector Based on FePSe₃/MoS₂ Heterostructure Response to 10.6 µm

Abstract

Metal phosphorous tri-chalcogenides are a category of new ternary 2D layered materials with a wide range of tuneable bandgaps (1.2-3.5 eV). These wide-bandgap semiconductors exhibit great potential applications in solar-blind ultraviolet (SBUV) photodetection. However, these 2D solarblind photodetectors suffer from low photoresponsivity, slow photoresponse speed, and narrow operation spectral region, thereby limiting their practical applications. Here, an ultra-broadband photodetection based on a FePSe 3 / MoS 2 heterostructure with coverage ranging from solar-blind ultraviolet 265 nm to longwave infrared (LWIR) 10.6 µm is reported. Notably, the device exhibits excellent weak light detection capability. A high photoresponsivity of 33 600 A W −1 and an external quantum efficiency of 1.57 × 10 7 % are demonstrated. A noise-equivalent power as low as 5.7 × 10 -16 W Hz −1/2 and a specific detectivity up to 1.51 × 10 13 cm Hz 1/2 W −1 are realized in the SBUV region. The room temperature LWIR photoresponsivity of 0.12 A W −1 is realized. This work opens a route to design high-performance SBUV photo detectors and wide spectral photoresponse applications.

Boosting the Sensitivity of WSe2 Phototransistor via Janus Interfaces with 2D Perovskite and Ferroelectric Layers

“…As shown in Figure g, the device still displays an obvious photoresponse even under ultraweak light intensity as low as 1.6 nW/cm 2 , while R is 2.3 × 10 5 A/W and D * is 4.1 × 10 14 Jones under the test condition of V g = 0, V ds = 0.1 V (the spectral noise density measured under dark conditions with V ds = 0.1 V is shown in Figure S10). Figure h summarizes the competitive values of threshold light intensity in the field of 2D semiconductor-based photodetectors, ,,,,,,,, in which our device is the best. The excellent performance in weak-light detection ability for our device mainly stems from the vertical Janus-interface device architecture, combining with the upper perovskite for providing generous photoexcited holes to WSe 2 and the lower ferroelectric film for suppressing the dark current dramatically.…”

2D Ruddlesden–Popper perovskite sensitized SnP2S6 ultraviolet photodetector enabling high responsivity and fast speed

“…Ultraviolet (UV) photodetectors have drawn extensive attention for their wide application in military surveillance, optical communications, flame detection, environmental monitoring, and biological analysis. [1][2][3][4] Two-dimensional layered metal phosphorus chalcogenides (2D LMPCs) with wide bandgaps of 1.3-4.5 eV are prospective candidates for next-generation UV photodetectors due to their excellent optoelectronic properties and ease of integration. [5][6][7] Currently, tremendous efforts have been devoted to investigate the UV photodetection performance of 2D LMPCs with various compositions and structures.…”

Flexible Omnidirectional Self-Powered Photodetectors Enabled by Solution-Processed Two-Dimensional Layered PbI2 Nanoplates

“…The photodetector, with the ability to convert optical signals into electrical signals, has been widely applied in various fields ranging from image sensing and biochemical detection to optical communication. − The ever-increasing advancements in portable and flexible technology call for photodetectors with excellent omnidirectional photosensitivity because the ability to detect light from omnidirectional angles is urgent in omnidirectional cameras, optical tracing systems, and wearable fashionable optoelectronic devices. ,− However, because of the limit of weak absorption, the ability of the majority of reported photodetectors to absorb incident light efficiently in multiple directions remains a challenge. , Therefore, improving the absorption is one of the indispensable ingredients for next-generation 360° omnidirectional photodetectors. For improving the light absorption, assembling bulky lenses, optimizing the structure of photodetector, and using materials with strong absorption are the main means to supplement the 360° photodetection.…”