Abstract Optoelectronic performance of 2D transition metal dichalcogenides (TMDs)‐based solar cells and self‐powered photodetectors remain limited due to fabrication challenges, such as difficulty in doping TMDs form p–n junctions. Herein, MoS 2 diodes based on geometrically asymmetric contact areas are shown achieve a high current rectification ratio ≈10 5 , facilitating efficient photovoltaic charge collection. Under illumination, the device demonstrates open‐circuit voltage ( V oc ) 430...

Abstract The elevation of cytokine levels in body fluids has been associated with numerous health conditions. detection these biomarkers at low concentrations may help clinicians diagnose diseases an early stage. Here, we report asymmetric geometry MoS 2 diode-based biosensor for rapid, label-free, highly sensitive, and specific tumor necrosis factor-α (TNF-α), a proinflammatory cytokine. This sensor is functionalized TNF-α binding aptamers to detect as 10 fM, well below the typical found...

Self-powered broadband photodetectors have attracted great interest due to their applications in biomedical imaging, integrated circuits, wireless communication systems, and optical switches. Recently, significant research is being carried out develop high-performance self-powered based on thin 2D materials heterostructures unique optoelectronic properties. Herein, a vertical heterostructure p-type WSe2and n-type film ZnO realized for with response the wavelength range of 300-850 nm. Due...

Volatile organic compounds (VOCs) sensors have a broad range of applications including healthcare, process control, and air quality analysis. There are variety techniques for detecting VOCs such as optical, acoustic, electrochemical, chemiresistive sensors. However, existing commercial VOC detectors drawbacks high cost, large size, or lack selectivity. Herein, new sensing mechanism is demonstrated based on surface interactions between UV-excited 2D germanium sulfide (GeS), which provides an...

Recently, atomically thin two-dimensional (2D) transition-metal dichalcogenides (TMDs) have attracted great interest in electronic and opto-electronic devices for high-integration-density applications such as data storage due to their small vertical dimension high capability. Here, we report a memristor based on free-standing multilayer molybdenum disulfide (MoS2) with current on/off ratio of ∼103 stable retention at least 3000 s. Through light modulation the carrier density suspended MoS2...

Abstract Polarization‐sensitive and self‐driven pyroelectric‐based photodetectors have recently gained interest due to their potential application in artificial electronic eyes, biomedical imaging, optical switches. Here, a photodetector based on light modulation‐induced polarization depolarization of water molecules the surface 2D MoS 2 crystal is reported. The ‐water heterostructure serves as pyro‐phototronic device that converts light‐induced thermal energy electrical signals, leading...

As a new class of two-dimensional (2D) materials and group-VI chalcogen, tellurium (Te) has emerged as p-type semiconductor with high carrier mobility. Potential applications include high-speed opto-electronic devices for communication. One method to enhance the performance 2D material-based photodetectors is by integration IV group semiconductors such silicon (Si). In this work, we demonstrate self-powered, high-speed, broadband photodetector based on Te/n-type Si heterojunction. The...

Abstract Volatile organic compound (VOC) sensors have a broad range of applications including healthcare monitoring, product quality control, and air management. However, many such are demanding, requiring with high sensitivity selectivity. 2D materials extensively used in VOC sensing devices due to their large surface‐to‐volume ratio fascinating electronic properties. These properties, along exceptional flexibility, low power consumption, room‐temperature operation, chemical...

Photovoltaic devices capable of reversible photovoltaic polarity through external signal modulation may enable multifunctional optoelectronic systems. However, such are limited to those induced by gate voltage, electrical poling, or optical wavelength using complicated device architectures. Here, we show that the is also switchable with intensity incident light. The in light induces switching geometrically asymmetric MoS2 Schottky photodiodes, explained lowering barrier heights due trapping...

Here, we report 3D hierarchical SnO2 nanowire (NW) core-amorphous silicon shell on free-standing carbon nanotube paper (SnO2@a-Si/CNT paper) as an effective anode for flexible lithium-ion battery (LIB) application. This binder-free electrode exhibits a high initial discharge capacity of 3020 mAh g-1 with large reversible charge 1250 at current density 250 mA g-1. Compared to other NW or its core-shell nanostructured anodes, the fabricated SnO2@a-Si/CNT structure demonstrates outstanding...

Here, SnO2 nanoribbons (NRs) synthetized on the catalyst-free stainless steel (SS) substrate as a possible anode for Li-ion batteries (LIBs) have been reported. NRs were synthesized SS via vapor-solid (VS) growth approach. Morphological and structural characterizations of confirmed using scanning electron microscopy (SEM), transmission (TEM) microscopes x-ray diffraction (XRD) respectively. The prepared binder-free electrode demonstrated high initial discharge/charge capacities 1818/929 mAh...

Abstract Optoelectronic devices based on geometrically asymmetric architecture have recently attracted attention due to their high performance as photodetectors and simple fabrication process. Herein, a p‐type 2D MoSe 2 photodetector contacts is reported for the first time. The device exhibits current rectification ratio of ≈10 4 large self‐powered photovoltage responsivity ≈4.38 × 10 7 V W −1 , well maximum photocurrent ≈430 mA along with response time ≈2.3 ms under 470 nm wavelength at 3...

Molybdenum disulfide (MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> )/reduced Graphene Oxide (rGo)-based photodetector was fabricated based on a convenient method using novel aligned carbon nanotube (CNT) contact configuration. With this device, one can successfully meet the challenges in device fabrication nano-sized 2-D materials. For purpose, patterned CNTs were grown 285-nm SiO /Si substrate plasma-enhanced chemical vapor...

Abstract Contact‐induced electrification, commonly referred to as triboelectrification, is the subject of extensive investigation at liquid–solid interfaces due its wide range applications in electrochemistry, energy harvesting, and sensors. This study examines triboelectric between an ionic liquid 2D MoS 2 under light illumination. Notably, when a droplet slides across surface, increase generated current voltage observed forward direction, while decrease reverse direction. suggests...

Pyro-Phototronic Photodetectors Conventional photodetectors require an external voltage bias which can limit their applications, whereas pyro-phototronic use the combined photovoltaic and pyroelectric effects to detect optical signals at zero bias. In article number 2302651, Michael M. Adachi co-workers report a high-performance photodetection device based on MoS2–water heterojunction. The combination of simple fabrication process, polarization sensitivity, high responsivity makes...

Today, Li-ion batteries (LIBs) are the most common rechargeable used in electronic devices. SnO2 with theoretical specific capacity of 782 mAh/g is among best anode materials for LIBs. In this report, Three-dimensional nanowires (NWs) on carbon nanotube (CNT) thin film (SnO2 / CNT) fabricated using a combination vacuum filtration and thermal evaporation techniques. The resulting 3D heterostructure SnO2/CNT was characterized by X-ray diffraction, transmission electron microscopy (TEM)...

Abstract Transition metal dichalcogenides have gained considerable interest for vapour sensing applications due to their large surface-to-volume ratio and high sensitivity. Herein, we demonstrate a new self-powered volatile organic compounds (VOC) sensor based on asymmetric geometry multi-layer molybdenum disulfide (MoS2) diode. The contact of the MoS2 diode induces an internal built-in electric field resulting in self-powering via photovoltaic response. While illuminated by UV-light,...

The coupling of pyroelectric and photoelectric effects is a new method to enhance transient response while maintaining steady-state in photodetectors. Such photodetectors have recently attracted great attention due wide range potential applications including artificial electronic eyes, neuromorphic computing, color sensors, optical communications. Here, we report photodetector based on the pyroelectricity photoelectricity effect silicon-water heterojunction for first time. Facilitated by...