Electric bias-induced edge degradation of few-layer MoS2 devices. - In: Materials today, ISSN 2214-7853, Bd. 53 (2022), 2, S. 281-284
In this work, we experimentally investigate the effects of electric bias on the degradation of few-layer MoS2 back-gated field-effect transistors in ambient air. The devices were fabricated using mechanically exfoliated MoS2 flakes, which were transferred to a Si/SiO2 substrate by a PDMS-based transfer. We report an accelerated electric bias-induced degradation of the devices under investigation and used optical and scanning electron microscopy (SEM) to monitor changes of the morphology of the MoS2 channel. In particular, we found a linear dependency of the degradation on the electric field between the Ti/Au source and drain contacts. In addition, we identify four regions in which morphological changes occur, of which the edges of the MoS2 channel are most affected.
https://doi.org/10.1016/j.matpr.2021.05.298
Nanoscale surface morphology modulation of graphene - i-SiC heterostructures. - In: Materials today, ISSN 2214-7853, Bd. 53 (2022), 2, S. 289-292
A multitude gratings design consists of gratings with different pitches ranging from the micrometre down to sub 40 nm scale combined with sub 10 nm step heights modulating the surface morphology for length scale measurements is proposed. The surface morphology modulation was performed using electron beam lithography incorporating a standard semiconductor processing technology. The critical dimension, edge roughness, step heights and line morphology in dependence on the grating pitch is studied.
https://doi.org/10.1016/j.matpr.2021.06.427
Impact analysis of temperature and humidity effects on polishing. - In: EOS Annual Meeting (EOSAM 2021), (2021), 03011, S. 1-3
The polishing process for optical glass is one with intertwined chemical and mechanical processes. The aim of the present study is to verify whether control of these factors can be used to improve the efficiency of the polishing process.
https://doi.org/10.1051/epjconf/202125503011
Investigation of the contact resistance as a function of the temperature for connectors and wire terminals. - In: 30th International Conference on Electrical Contacts, (2021), S. 202-209
The hardness of coating materials such as tin or gold is temperature-dependent, so the contact area and thus the contact resistance change depending on the temperature. Contact resistance measurements are carried out on hard gold- and tin-coated connector contacts at elevated temperatures. It is shown that the contact resistance decreases significantly with increasing temperature. Tests are also being carried out with solid and stranded copper wires. In addition to the hardness, foreign layers on the copper conductors have a further influence on the contact resistance.
https://doi.org/10.22032/dbt.51522
Optical properties of nanoporous gold sponges using model structures obtained from three-dimensional phase-field Simulation. - In: 2021 Photonics & Electromagnetics Research Symposium (PIERS), (2021), S. 517-523
Nanoporous sponge structures show fascinating optical properties related to a strong spatial localization of field modes and a resulting strong field enhancement. In this work, a novel efficient method for the generation of three-dimensional nanoporous sponge structures using time-resolved phase-field simulations is presented. The algorithm for creating the geometries and the underlying equations are discussed. Different sponge geometries are generated and compared with sponges that have been experimentally measured using FIB tomography. Meaningful parameters are defined for the comparison of the geometric properties of the random sponge structures. In addition, the optical properties of the simulated sponges are compared with the experimentally measured sponges. It is shown that a description using effective media does not provide a good agreement to the actual spectra. This shows that the optical properties are largely determined by the local structures. In contrast, the numerically obtained spectra of the phase-field sponge models accounting for the real-space structure show excellent agreement with the spectra of the experimentally measured sponges.
https://doi.org/10.1109/PIERS53385.2021.9694971
Wafer-level fabrication of an EWOD-driven micropump. - In: MikroSystemTechnik, (2021), S. 574-577
Characterization of reactive multilayer systems deposited on LTCC featuring different surface morphologies. - In: MikroSystemTechnik, (2021), S. 506-510
Assembly of single-nanowires by combining soft transfer and surface controlled contact printing. - In: MikroSystemTechnik, (2021), S. 442-445
Effiziente Plasmastrukturierung komplexer Gläser mit polymeren Resistmasken durch statistische Versuchsplanung. - In: MikroSystemTechnik, (2021), S. 422-425
Maskless pattern transfer into photostructurable glasses by deep plasma etching. - In: MikroSystemTechnik, (2021), S. 419-421