A5058945159- Graphene research and applications
- Molecular Junctions and Nanostructures
- 2D Materials and Applications
- Quantum and electron transport phenomena
- Semiconductor materials and devices
- Graphene and Nanomaterials Applications
- Supramolecular Self-Assembly in Materials
- Surface Chemistry and Catalysis
- Advancements in Semiconductor Devices and Circuit Design
Max Planck Institute for Polymer Research
2017-2022
Johannes Gutenberg University Mainz
2017-2020
University of Applied Sciences Mainz
2020
Technische Universität Ilmenau
2018
Graphene nanoribbons (GNRs) with atomically precise width and edge structures are a promising class of nanomaterials for optoelectronics, thanks to their semiconducting nature high mobility charge carriers. Understanding the fundamental static optical properties ultrafast dynamics carrier generation in GNRs is essential optoelectronic applications. Combining THz spectroscopy theoretical calculations, we report strong exciton effect binding energy up ∼700 meV liquid-phase-dispersed 1.7 nm an...
Bottom-up synthesis of low-bandgap graphene nanoribbons with various widths is great importance for their applications in electronic and optoelectronic devices. Here we demonstrate a N = 5 armchair (5-AGNRs) lateral fusion into wider AGNRs, by chemical vapor deposition method. The efficient formation 10- 15-AGNRs revealed combination different spectroscopic methods, including Raman UV–vis-near-infrared spectroscopy as well scanning tunneling microscopy. degree thus the optical properties...
Abstract In graphene nanoribbons (GNRs), the lateral confinement of charge carriers opens a band gap, key feature that enables novel graphene-based electronics. Despite great progress, reliable and reproducible fabrication single-ribbon field-effect transistors (FETs) is still challenge, impeding understanding transport. Here, we present armchair GNR-FETs based on networks analyze transport mechanism using nine-atom wide and, in particular, five-atom-wide GNRs with large conductivity. We...
In this Communication, we report the first synthesis of structurally well-defined graphene nanoribbons (GNRs) functionalized with dendritic polymers. The resultant GNRs possess grafting ratios 0.59–0.68 for dendrons different generations. Remarkably, precise 3D branched conformation grafted affords unprecedented 1D supramolecular self-assembly behavior in tetrahydrofuran (THF), yielding nanowires, helices and nanofibers depending on dimension dendrons. GNR superstructures THF exhibit...
Abstract The electronic properties of graphene can be efficiently altered upon interaction with the underlying substrate resulting in a dramatic change charge carrier behavior. Here, evolution local epitaxial on metal controlled formation multilayers, which are produced by intercalation atomic carbon graphene/Ir(111), is investigated. Using scanning tunneling microscopy and Landau‐level spectroscopy, it shown that for monolayer bilayers small‐angle rotations, Landau levels fully suppressed,...
Graphene nanoribbons functionalized with methoxy groups were synthesized. Theoretical studies predicted reduced bandgap and effective mass of charge carriers. THz spectroscopy revealed ∼25% enhancement the photoconductivity.
Defects in the oxide layer are main cause for hysteresis graphene nanoribbon FETs.
In graphene nanoribbons (GNRs), the lateral confinement of charge carriers opens a band gap, key feature to enable novel graphene-based electronics. Successful synthesis GNRs has triggered efforts realize field-effect transistors (FETs) based on single ribbons. Despite great progress, reliable and reproducible fabrication single-ribbon FETs is still challenge that impedes applications understanding transport. Here, we present armchair GNR-FETs network analyze transport mechanism using...
In this work, we fabricated a 2D van der Waals heterostructure device in an inert nitrogen atmosphere by means of dry transfer technique order to obtain clean and largely impurity free stack hexagonal boron nitride (hBN)-encapsulated few-layer graphene. The was contacted from the top with gold leads on two sides, device’s properties including intrinsic charge carrier density, mobility, contact resistance were studied as function temperature 4 K 270 K. We show that mainly originates...