Electroluminescence from Megasonically Solution-Processed MoS₂ Nanosheet Films

ACS Nano, Journal Year: 2023, Volume and Issue: 17(17), P. 17516 - 17526

Published: Aug. 22, 2023

Due to their superior optoelectronic properties, monolayer two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted significant attention for electroluminescent devices. However, challenges in isolating optoelectronically active TMD monolayers using scalable liquid phase exfoliation precluded electroluminescence large-area, solution-processed films. Here, we overcome these limitations and demonstrate from molybdenum disulfide (MoS2) nanosheet films by employing a monolayer-rich MoS2 ink produced electrochemical intercalation megasonic exfoliation. Characteristic photoluminescence spectral peaks at 1.88-1.90 eV are observed megasonicated films, with the emission intensity increasing film thickness over range 10-70 nm. Furthermore, vertical light-emitting capacitor architecture enables uniform large-area These results indicate that megasonically exfoliated retain direct bandgap character electrically percolating thin even following multistep solution processing. Overall, this work establishes inks as an additive manufacturing platform flexible, patterned, miniaturized light sources can likely be expanded other semiconductors.

Language: Английский

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Inkjet-Printed MoS₂ Nanoplates on Flexible Substrates for High-Performance Field Effect Transistors and Gas Sensing Applications

ACS Applied Nano Materials, Journal Year: 2023, Volume and Issue: 6(5), P. 3236 - 3244

Published: Feb. 27, 2023

Owing to the simplicity, scalability, and cost-efficiency, solution-processable two-dimensional (2D) semiconductors have attracted great interest in electronic applications, especially as channel material for field-effect transistors (FETs). Inkjet printing is a lithography-free technique achieve drop-on-demand patterning of 2D ink. However, thus far, inkjet-printed FETs exhibit limited performance due coffee-ring effect consequent discontinuity printed films. Here, we report high-performance flexible MoS2 with high mobilities on/off ratios their gas sensing applications. By preparing high-quality ink comprised nanoplates using electrochemical exfoliation then applying binary solvent 2-butanol isopropanol, obtained was form continuous relatively uniform film, were demonstrated, 11 cm2 V–1 s–1 106. Furthermore, low-voltage gate modulation achieved by an ion gel gate, robust electrical under tensile strain observed gel-gated on substrates. As film abundant edge sites sulfur vacancies, further demonstrated our sensors limit detection 10 ppb NO2 0.5 ppm NH3, together fast recovery rate.

Language: Английский

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A fully printed ultrafast Si/WS₂ quantum dot photodetector with very high responsivity over the UV to near-infrared region

Nanoscale, Journal Year: 2023, Volume and Issue: 15(33), P. 13809 - 13821

Published: Jan. 1, 2023

Two-dimensional (2D) semiconducting material-based photodetectors (PDs) with high responsivity and fast photo-response are of great interest for various applications such as optical communications, biomedical imaging, security surveillance, environmental monitoring, etc. Additive manufacturing 2D printing is a potentially less cumbersome cost-effective alternative to conventional microdevice fabrication processes used in the production PDs. Here, we have fabricated Si/WS2 quantum dot-based heterostructure PD very short electrode gap 40 μm by simple process. The printed p-Si/n-WS2 shows an excellent photo-to-dark current ratio 5121 under 405 nm illumination (23.8 mW cm-2). photodetector exhibits peak 126 A W-1 detectivity 9.24 × 1012 Jones over broad wavelength range (300-1100 nm), which much superior commercial Si external efficiency 3.9 104% ultrafast photoresponse (7.8 μs rise time 9.5 fall time) make device attractive candidate efficient photodetector. origin high-performance photodetection traced nearly defect-free interface at heterojunction, leading highly charge separation photocurrent. Finally, 2D-printed good even self-powered conditions, attractive.

Language: Английский

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Tunable p/n property of WS2 nanosheets-based ammonia gas sensor: Assembled by drop-coating and aerosol-jet printing

Applied Surface Science, Journal Year: 2024, Volume and Issue: 655, P. 159612 - 159612

Published: Feb. 5, 2024

Language: Английский

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High‐Performance Te Nanowires/MoS₂/Polyimine Nanocomposite‐Based Self‐Healable, Recyclable and Screen‐Printable Flexible Photodetector for Image Sensing

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(24)

Published: Feb. 20, 2024

Abstract Intrinsically flexible photodetectors are compelling building blocks for next‐generation wearable optoelectronic systems owing to their distinctive advantages of reliable structural durability and versatile scalability large‐scale production. However, practical applications still impeded by the inferior photodetection performance, irreversible device failure after breakage, serious e‐waste accumulation service life. Herein, a high‐performance intrinsically flexible, mechanically durable, self‐healable, closed‐loop recyclable, screen‐printable Te NWs/MoS 2 nanosheets/polyimine nanocomposite‐based photodetector designed engineering‐ordered‐bridged 1D/2D carrier percolation “fast lanes” in dynamic covalent polyimine matrix via flow‐designed solution‐shearing method. Such design provides sixfold, 20.1‐fold, 6.9‐fold enhancement mobility, responsivity (11.68 mA W −1 ), detectivity (1.145 × 10 Jones), respectively, as well stable photoresponse over eight months or 50 000 bending‐flattening times. Meanwhile, this presents excellent self‐healing efficiency repeatable recyclability reconfiguration. Furthermore, these merits can be fully integrated onto textile assembling nacre‐like /polyimine nanocomposite coatings on textiles screen‐printing processes, enabling programmable patterning arrays large‐area image sensing. This work viable approach shape‐tunable optoelectronics with mechanical customizable functionalities, demonstrating tremendous potential systems.

Language: Английский

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