A5036285962- 2D Materials and Applications
- Graphene research and applications
- Molecular Junctions and Nanostructures
- Chalcogenide Semiconductor Thin Films
- MXene and MAX Phase Materials
- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Fiber-reinforced polymer composites
- Nanowire Synthesis and Applications
- Plasmonic and Surface Plasmon Research
- Semiconductor materials and interfaces
- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Photonic and Optical Devices
- Surface and Thin Film Phenomena
- Water Quality Monitoring and Analysis
- Crystal Structures and Properties
- Strong Light-Matter Interactions
- Neural Networks and Reservoir Computing
- Analytical Methods in Pharmaceuticals
- Advanced Photocatalysis Techniques
- Analytical Chemistry and Sensors
- Electrocatalysts for Energy Conversion
Trinity College Dublin
2018-2023
Advanced Materials and BioEngineering Research
2018-2023
KU Leuven
2015-2018
22q11 Ireland
2018
IMEC
2015-2017
We demonstrate a back-gate modulated field-emission current from WSe<sub>2</sub> monolayer and propose new vertical transistor concept.
Large area MoS 2 films with tunable physical‐chemical properties are grown on dielectric substrates by annealing of ultrathin Mo layers in the presence a sulfur‐containing gaseous precursor. Different growth conditions found to have significant impact material properties, including chemical composition, roughness, and grain sizes, thus shedding light critical parameters that govern sulfurization processes for synthesis large 2D transition metal dichalcogenides. Optimized combination use...
We study the effect of polymer coating, pressure, temperature, and light on electrical characteristics monolayer WSe 2 back-gated transistors with Ni / Au contacts. Our investigation shows that removal a layer poly(methyl methacrylate) (PMMA) or decrease pressure change device conductivity from p- to n-type. From temperature behavior transistor transfer characteristics, gate-tunable Schottky barrier at contacts is demonstrated height ~ 70 meV in flat-band condition measured. also report...
The interest in 2D materials continues to grow across numerous scientific disciplines as compounds with unique electrical, optical, chemical, and thermal characteristics are being discovered. All these properties governed by an all-surface nature nanoscale confinement, which can easily be altered extrinsic influences, such defects, dopants or strain, adsorbed molecules, contaminants. Here, we report on the ubiquitous presence of polymeric adlayers top layered transition metal dichalcogenides...
The key steps of a transfer two-dimensional (2D) materials are the delamination as-grown material from growth substrate and lamination 2D on target substrate. In state-of-the-art experiments, these remain very challenging, variations often result in unreliable properties. Here, it is demonstrated that interfacial water can insert between graphene its despite hydrophobic behavior graphene. It understood essential for an electrochemistry-based Pt surface. Additionally, to wafer hindered by...
Rabi splitting between the longitudinal plasmon of a gold nano-bipyramid and A exciton monolayer MoS2 is observed at room temperature. The dependence on physical dimensions reported. impact bipyramid length, aspect ratio, tip radius coupling strength investigated. mode volume nanoresonator significantly reduced because sharp tips bipyramid, increases with sharpness. results also reveal that greater for larger bipyramids, contrasting previously reported different shapes. This shows, first...
Crystalline substrates are known to function as a template for the growth of Van der Waals materials. materials, specifically transition metal dichalcogenides, have gained attention in past decade due their interesting chemical and physical properties, well potential they hold applications, particularly field (opto‐)electronics. The crystalline quality these materials can be improved by epitaxial growth. Herein, influence substrate selection has on ordering MoS 2 is examined. Specifically,...
We study the effect of polymer coating, pressure, temperature and light on electrical characteristics monolayer WSe2 back-gated transistors with quasi-ohmic Ni/Au contacts. prove that removal a layer poly(methyl methacrylate) or decrease pressure change device conductivity from p to n-type. demonstrate gate-tunable Schottky barrier at contacts measure height ~70 meV in flat-band condition. report discuss temperature-driven mobility subthreshold slope which we use estimate trap density...
Abstract Non‐covalent functionalization of layered 2D materials is an essential tool to modify and fully harness their optical, electrical, chemical properties. Herein, a facile method enabling the selective formation self‐assembled monolayers (SAMs) perylene bisimide (PBI) on transition metal dichalcogenides (TMDs), directly growth substrate (on‐chip), presented. Laterally‐resolved infrared atomic force microscopy (AFM‐IR) time‐of‐flight secondary ion mass spectrometry (TOF‐SIMS) are...
A reliable CMOS compatible graphene integration route is still missing today. An overview of CVD growth on Cu, Pt and Ge catalyst template wafers given. Due to the high temperatures in combination with necessity a layer, direct devices unfeasible. As result, transfer process semiconductor absolutely required. several approaches given, starting standard wet etch based transfer. Next, PVA peeling electrochemical bubble are described. Furthermore, current bottlenecks identified. The paper ends...
Absorbance of monolayer MoS${}_{2}$ is weak due to its atomic thickness. This poses an obstacle for applications. The authors reveal numerically and experimentally that the resonance dielectric Si nanodisks can enhance absorbance emission MoS${}_{2}$. Taking into account both quantum efficiency modifications by disk resonators, their model successfully explains observed enhancement under normal light incidence. An underlying gold mirror further strengthens A perfectly absorbing structure...
Transition metal dichalcogenides (TMDs) have been a core constituent of 2D material research throughout the last decade. Over this time, focus has progressively shifted from synthesis and fundamental investigations, to exploring their properties for applied such as electrochemical applications integration in electrical devices. Due rapid pace development, priority is often given application-oriented aspects while careful characterisation analysis TMD materials themselves occasionally...
More than 10 years have passed since A. Geim and K. Novoselov published their ground breaking papers that triggered the worldwide 2D material research. Currently, first graphene products are being commercialized (e.g. inks, reinforced nanocomposites), but market is still in its infancy. Graphene has potential to become an important semiconductor industry due outstanding properties high mobility, transparency, gapless character which makes it absorb light from UV up THz spectral regimes,...
Today, CMOS compatible routes to grow and transfer large graphene sheets are still missing. Chemical vapor deposition (CVD) is the main synthesis technique yielding high-quality wafer-scale graphene. Platinum expected be an excellent catalyst monolayer, scale Moreover, electrochemical methods demonstrated, which facilitate reusability of this expensive Pt template. A process window studied on platinum foils. The influence growth temperature time as well methane hydrogen ratio optimized....
Tungsten ditelluride is a layered transition metal dichalcogenide (TMD) that has attracted increasing research interest in recent years. WTe2 demonstrated large non-saturating magnetoresistance, potential for spintronic applications and promise as type-II Weyl semimetal. The majority of works on have relied mechanically-exfoliated flakes from chemical vapour transport (CVT) grown crystals their investigations. While producing high-quality samples, this method hindered by several...
Strong coupling was detected between single gold nano-bipyramids and mono-layer MoS 2 . It demonstrated that the strength increases with nanoparticle size, even without increasing number of excitons coupled into system.
Rabi splitting occurs when the exchange of energy between an exciton and plasmon is quicker than their intrinsic dissipation rates. When these conditions are met, system splits into two entirely new eigenstates above below original exciton. These peaks called polaritons.