Bernd Hähnlein
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View article: Wafer-scale technology for the integration of molybdenum disulfide into vertical electronic device structures
Wafer-scale technology for the integration of molybdenum disulfide into vertical electronic device structures Open
Two-dimensional (2D) materials, in particular transition metal dichalcogenides (TMDCs), have been recognized as material class with great potential for future electronic devices. However, to realize the potential of these materials, techno…
View article: Grains, grain boundaries in single and few layer MoS<sub>2</sub>
Grains, grain boundaries in single and few layer MoS<sub>2</sub> Open
This study investigates the chemical vapour deposition (CVD) of molybdenum disulfide (MoS 2 ) on SiO 2 , examining the formation of various grains and grain boundaries (GBs) in single- to few-layer MoS 2 . The material, optical, and electr…
View article: Ultrafast Exciton and Charge Carrier Dynamics in Monolayer MoS<sub>2</sub> Measured with Time‐Resolved Spectroscopic Ellipsometry
Ultrafast Exciton and Charge Carrier Dynamics in Monolayer MoS<sub>2</sub> Measured with Time‐Resolved Spectroscopic Ellipsometry Open
Due to their unique optical properties, 2D monolayer transition metal dichalcogenides (TMDCs) show great potential for future electronic and photonic devices, but for real applications, the performance of those is still in need of improvem…
View article: Gate-tunable hysteresis response of field effect transistor based on sulfurized Mo
Gate-tunable hysteresis response of field effect transistor based on sulfurized Mo Open
Hysteresis effects and their tuning with electric fields and light were studied in thin film molybdenum disulfide transistors fabricated from sulfurized molybdenum films. The influence of the back-gate voltage bias, voltage sweep range, il…
View article: Evaluation of Hysteresis Response in Achiral Edges of Graphene Nanoribbons on Semi-Insulating SiC
Evaluation of Hysteresis Response in Achiral Edges of Graphene Nanoribbons on Semi-Insulating SiC Open
Hysteresis response of epitaxially grown graphene nanoribbons devices on semi-insulating 4H-SiC in the armchair and zigzag directions is evaluated and studied. The influence of the orientation of fabrication and dimensions of graphene nano…
View article: Three-Dimensional MoS2 Nanosheet Structures: CVD Synthesis, Characterization, and Electrical Properties
Three-Dimensional MoS2 Nanosheet Structures: CVD Synthesis, Characterization, and Electrical Properties Open
The proposed study demonstrates a single-step CVD method for synthesizing three-dimensional vertical MoS2 nanosheets. The postulated synthesizing approach employs a temperature ramp with a continuous N2 gas flow during the deposition proce…
View article: Effect of Poly‐Crystallinity on the Magnetoelectric Behavior of TiN/AlN/Ni MEMS Cantilevers Investigated by Finite Element Methods
Effect of Poly‐Crystallinity on the Magnetoelectric Behavior of TiN/AlN/Ni MEMS Cantilevers Investigated by Finite Element Methods Open
Herein, magnetoelectric microelectromechanical system (MEMS) cantilevers are investigated on basis of a TiN/AlN/Ni laminate derived from experimental sensors using finite‐element simulations. With the anisotropic Δ E effect as an implicati…
View article: Anisotropy of the ΔE Effect in Ni-Based Magnetoelectric Cantilevers: A Finite Element Method Analysis
Anisotropy of the ΔE Effect in Ni-Based Magnetoelectric Cantilevers: A Finite Element Method Analysis Open
In recent investigations of magnetoelectric sensors based on microelectromechanical cantilevers made of TiN/AlN/Ni, a complex eigenfrequency behavior arising from the anisotropic ΔE effect was demonstrated. Within this work, a FEM simulati…
View article: Silicon Carbide - Graphene Nano-Gratings on 4H and 6H Semi-Insulating SiC
Silicon Carbide - Graphene Nano-Gratings on 4H and 6H Semi-Insulating SiC Open
A technical methodology of fabrication of hierarchically scaled multitude graphene nanogratings with varying pitches ranging from the micrometer down to sub 40 nm scale combined with sub 10 nm step heights on 4H and 6H semi-insulating SiC …
View article: Anisotropy of the E Effect in Ni-based Magnetoelectric Cantilevers: A Finite Element Method Analysis
Anisotropy of the E Effect in Ni-based Magnetoelectric Cantilevers: A Finite Element Method Analysis Open
Magnetoelectric sensors based on microelectromechanical cantilevers consisting of TiN / AlN / Ni are investigated using finite element simulations in regard of the anisotropy of the E effect and its impact on the sensor sensitivity. The E …
View article: Automated Parameter Extraction Of ScAlN MEMS Devices Using An Extended Euler–Bernoulli Beam Theory
Automated Parameter Extraction Of ScAlN MEMS Devices Using An Extended Euler–Bernoulli Beam Theory Open
Magnetoelectric sensors provide the ability to measure magnetic fields down to the pico tesla range and are currently the subject of intense research. Such sensors usually combine a piezoelectric and a magnetostrictive material, so that ma…
View article: Radiative Pumping and Propagation of Plexcitons in Diffractive Plasmonic Crystals
Radiative Pumping and Propagation of Plexcitons in Diffractive Plasmonic Crystals Open
Strong coupling between plasmons and excitons leads to the formation of plexcitons: quasiparticles that combine nanoscale energy confinement and pronounced optical nonlinearities. In addition to these localized modes, the enhanced control …
View article: Multispectral electroluminescence enhancement of single-walled carbon nanotubes coupled to periodic nanodisk arrays
Multispectral electroluminescence enhancement of single-walled carbon nanotubes coupled to periodic nanodisk arrays Open
The integration of periodic nanodisk arrays into the channel of a light-emitting field-effect transistor leads to enhanced and directional electroluminescence from thin films of purified semiconducting single-walled carbon nanotubes. The m…
View article: Surface Lattice Resonances for Enhanced and Directional Electroluminescence at High Current Densities
Surface Lattice Resonances for Enhanced and Directional Electroluminescence at High Current Densities Open
Hybrid photonic-plasmonic modes in periodic arrays of metallic nanostructures offer a promising trade-off between high-quality cavities and subdiffraction mode confinement. However, their application in electrically driven light-emitting d…
View article: Broadband Tunable, Polarization-Selective and Directional Emission of (6,5) Carbon Nanotubes Coupled to Plasmonic Crystals
Broadband Tunable, Polarization-Selective and Directional Emission of (6,5) Carbon Nanotubes Coupled to Plasmonic Crystals Open
We demonstrate broadband tunability of light emission from dense (6,5) single-walled carbon nanotube thin films via efficient coupling to periodic arrays of gold nanodisks that support surface lattice resonances (SLRs). We thus eliminate t…