2D Few-Layered PdPS: Toward High-Efficient Self-Powered Broadband Photodetector and Sensors

Abstract

Photodetectors and sensors have a prominent role in our lives and cover a wide range of applications, including intelligent systems and the detection of harmful and toxic elements. Although there have been several studies in this direction, their practical applications have been hindered by slow response and low responsiveness. To overcome these problems, we have presented here a self-powered (photoelectrochemical, PEC), ultrasensitive, and ultrafast photodetector platform. For this purpose, a novel few-layered palladium–phosphorus–sulfur (PdPS) was fabricated by shear exfoliation for effective photodetection as a practical assessment. The characterization of this self-powered broadband photodetector demonstrated superior responsivity and specific detectivity in the order of 33 mA W–1 and 9.87 × 1010 cm Hz1/2 W–1, respectively. The PEC photodetector also exhibits a broadband photodetection capability ranging from UV to IR spectrum, with the ultrafast response (∼40 ms) and recovery time (∼50 ms). In addition, the novel few-layered PdPS showed superior sensing ability to organic vapors with ultrafast response and a recovery time of less than 1 s. Finally, the photocatalytic activity in the form of hydrogen evolution reaction was explored due to the suitable band alignment and pronounced light absorption capability. The self-powered sensing platforms and superior catalytic activity will pave the way for practical applications in efficient future devices.

Controllable Coating Graphene Oxide and Silanes on Cu Particles as Dual Protection for Anticorrosion

“…32 Further information about the chemical composition and thermal stability of GO-A-Cu can be obtained from TGA (Figure 5g). 34 The original Cu shows a slight mass loss of about 0.1 wt % from 700 until 1000 °C connected to the partial dissociation of copper oxide. All GO-A-Cu samples show two steps of weight loss at ∼195 and ∼550 °C, corresponding to the removal of oxygen-containing functional groups from GO and the further condensation/decomposition of APTES, respectively.…”

Hydrogen-Terminated Two-Dimensional Germanane/Silicane Alloys as Self-Powered Photodetectors and Sensors

“…The sensing performance of the device was illustrated by an equivalent circuit, as shown in Figure S27, where the sensing response can be simplified by three resistor− capacitor circuit (RC) circuits connected in parallel. 13 The two RC circuits on the left and right sides (Figure S27) represent the contact point between the surfaces of the exfoliated material and the Au finger electrode, while the middle RC circuit represents the interaction between the layers of the 2D materials. Finally, the long-term stability of the sensor device was also verified, as shown in Figure S28, which shows a quite stable response after 5 days.…”

“…In addition, the sensor reaches its original current density within 1 s (Figure S26c), without heating or other external disturbances. The sensing performance of the device was illustrated by an equivalent circuit, as shown in Figure S27, where the sensing response can be simplified by three resistor–capacitor circuit (RC) circuits connected in parallel . The two RC circuits on the left and right sides (Figure S27) represent the contact point between the surfaces of the exfoliated material and the Au finger electrode, while the middle RC circuit represents the interaction between the layers of the 2D materials.…”

“…The last two decades have belonged to various 2D materials such as graphene, black phosphorus (BP), and transition-metal compounds due to their exceptional properties such as 2D quantum confinement and tuneable layer structure. − These 2D materials offer a wide range of applications ranging from sensors, photodetectors, energy storage, catalysis to health monitoring. − ,− Graphene has been extensively studied due to its superior charge carrier mobility, thermal conductivity, and flexibility . However, its application is hampered by the lack of a band gap .…”

Chalcogen (S, Se, and Te) decorated few-layered Ti3C2Tx MXene hybrids: modulation of properties through covalent bonding

“…Two-dimensional (2D) nanomaterials are capable of providing unique properties because of their attractive physical (i.e., electrical-and photo-conductivity), chemical (i.e., catalytic activity), and mechanical (i.e., high stability) properties. [1][2][3][4][5][6] These fascinating characteristics of 2D nano-materials are due to their ultrathin planar structures which result in strong quantum confinement and their large surface area. [7][8][9] Among the different varieties of invented and synthesized 2D nanomaterials, transition-metal carbides and carbonitrides (MXenes) have demonstrated admirable performances because of their wide specific surface area, and tendency to be bonded covalently with guest atoms because of the inner metal vacancies which are generated during their synthesis.…”