| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Hofmann, Stephan
University of Cambridge
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (46/46 displayed)
- 2024Controlled Fabrication of Native Ultra-Thin Amorphous Gallium Oxide From 2D Gallium Sulfide for Emerging Electronic Applications
- 2023Fast Twist Angle Mapping of Bilayer Graphene Using Spectroscopic Ellipsometric Contrast Microscopy.
- 2022Defect seeded remote epitaxy of GaAs films on graphene.
- 2021Giant photoluminescence enhancement in MoSe2 monolayers treated with oleic acid ligands.
- 2021Piezoelectric materials for energy harvesting and sensing applicationscitations
- 2021Rational Passivation of Sulfur Vacancy Defects in Two-Dimensional Transition Metal Dichalcogenidescitations
- 2021Piezoelectric Materials for Energy Harvesting and Sensing Applications: Roadmap for Future Smart Materials
- 2021Rational Passivation of Sulfur Vacancy Defects in Two-Dimensional Transition Metal Dichalcogenides.
- 2021Piezoelectic Materials for energy harvesting and sensing applications: roadmap for future smart materialscitations
- 2020High-Throughput Electrical Characterization of Nanomaterials from Room to Cryogenic Temperatures.
- 2020High-Throughput Electrical Characterization of Nanomaterials from Room to Cryogenic Temperatures.
- 2020Integrated Wafer Scale Growth of Single Crystal Metal Films and High Quality Graphene.
- 2020High-throughput electrical characterization of nanomaterials from room to cryogenic temperaturescitations
- 2020Understanding metal organic chemical vapour deposition of monolayer WS2: the enhancing role of Au substrate for simple organosulfur precursors.
- 2020Integrated wafer scale growth of single crystal metal films and high quality graphenecitations
- 2020Graphene-passivated nickel as an efficient hole-injecting electrode for large area organic semiconductor devicescitations
- 2020Understanding metal organic chemical vapour deposition of monolayer WS<sub>2</sub>: the enhancing role of Au substrate for simple organosulfur precursors.
- 2020Catalytically mediated epitaxy of 3D semiconductors on van der Waals substratescitations
- 2019Spectrally Resolved Photodynamics of Individual Emitters in Large-Area Monolayers of Hexagonal Boron Nitridecitations
- 2019Enhancing Photoluminescence and Mobilities in WS2 Monolayers with Oleic Acid Ligands.
- 2019Spectrally Resolved Photodynamics of Individual Emitters in Large-Area Monolayers of Hexagonal Boron Nitride.
- 2018Non-destructive Thickness Mapping of Wafer-Scale Hexagonal Boron Nitride Down to a Monolayercitations
- 2018Compressive Behavior and Failure Mechanisms of Freestanding and Composite 3D Graphitic Foamscitations
- 2018Reduced Graphene Oxide as a Monolithic Multifunctional Conductive Binder for Activated Carbon Supercapacitors.
- 2018Insulator-to-Metallic Spin-Filtering in 2D-Magnetic Tunnel Junctions Based on Hexagonal Boron Nitridecitations
- 2018Insulator-to-Metallic Spin-Filtering in 2D-Magnetic Tunnel Junctions Based on Hexagonal Boron Nitridecitations
- 2017Engineering the Photoresponse of InAs Nanowires.
- 2017Engineering the Photoresponse of InAs Nanowirescitations
- 2017Chemical vapour deposition of freestanding sub-60 nm graphene gyroidscitations
- 2016Nanoscale Plasmon-Enhanced Spectroscopy in Memristive Switches.
- 2016In Situ Observations of Phase Transitions in Metastable Nickel (Carbide)/Carbon Nanocomposites.
- 2016Controlling nanowire growth through electric field-induced deformation of the catalyst dropletcitations
- 2016In Situ Observations of Phase Transitions in Metastable Nickel (Carbide)/Carbon Nanocompositescitations
- 2016In Situ Graphene Growth Dynamics on Polycrystalline Catalyst Foilscitations
- 2016Time Evolution of the Wettability of Supported Graphene under Ambient Air Exposurecitations
- 2015Influence of packing density and surface roughness of vertically-aligned carbon nanotubes on adhesive properties of gecko-inspired mimetics.
- 2014Bio-inspired hierarchical polymer fiber-carbon nanotube adhesivescitations
- 2014The role of the sp2:sp3 substrate content in carbon supported nanotube growthcitations
- 2014CVD growth of carbon nanostructures from zirconia: mechanisms and a method for enhancing yield.
- 2014The role of the sp 2 :sp 3 substrate content in carbon supported nanotube growthcitations
- 2014The influence of intercalated oxygen on the properties of graphene on polycrystalline Cu under various environmental conditionscitations
- 2014Nitrogen controlled iron catalyst phase during carbon nanotube growthcitations
- 2013Catalyst composition and impurity-dependent kinetics of nanowire heteroepitaxy.
- 2012The phase of iron catalyst nanoparticles during carbon nanotube growthcitations
- 2011In Situ Characterization of Alloy Catalysts for Low-Temperature Graphene Growthcitations
- 2003Low-temperature growth of carbon nanotubes by plasma-enhanced chemical vapor depositioncitations
Places of action
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article
Non-destructive Thickness Mapping of Wafer-Scale Hexagonal Boron Nitride Down to a Monolayer
Abstract
The availability of an accurate, nondestructive method for measuring thickness and continuity of two-dimensional (2D) materials with monolayer sensitivity over large areas is of pivotal importance for the development of new applications based on these materials. While simple optical contrast methods and electrical measurements are sufficient for the case of metallic and semiconducting 2D materials, the low optical contrast and high electrical resistivity of wide band gap dielectric 2D materials such as hexagonal boron nitride (hBN) hamper their characterization. In this work, we demonstrate a nondestructive method to quantitatively map the thickness and continuity of hBN monolayers and bilayers overlarge areas. The proposed method is based on acquisition and subsequent fitting of ellipsometry spectra of hBN on Si/SiO<sub>2</sub> substrates. Once a proper optical model is developed, it becomes possible to identify and map the commonly observed polymer residuals from the transfer process and obtain submonolayer thickness sensitivity for the hBNfilm. With some assumptions on the optical functions of hBN, the thickness of an as-transferred hBN monolayer on SiO<sub>2</sub> is measured as 4.1 Å ± 0.1 Å, whereas the thickness of an air-annealedhBN monolayer on SiO<sub>2</sub> is measured as 2.5 Å ±0.1 Å. We argue that the difference in the two measured values is due to the presence of a water layer trapped between the SiO<sub>2</sub> surface and the hBN layer in the latter case. The procedure can be fully automated to wafer scale and extended to other 2D materials transferred onto any polished substrate, as long as their optical functions are approximately known.