Projects

2-dimensional (2D) semiconductors such as 2D transition metal dichalcogenides (MX2) have recently drawn much attention in the field of nano-electronics due to their potential for superior electrostatic control and heterogeneous integration. However, current MX2 devices suffer from high source and drain contact resistance, high defect density and low capacitance/charge build-up in the channel. To mitigate these challenges, it would be ...

To continue the development and miniaturization of transistors, new materials and device concepts are required to be developed. This thesis provides a study of two new classes of materials, superlattices and two-dimensional (2D) materials, to assess their potential as a replacement for silicon in the transistor channel. To perform this analysis, modern modeling techniques are used to provide an atomistic description (molecular dynamics, ...

Traditional optical spectroscopies are unparalleled analytical tools in science. However, a fundamental physical barrier known as the diffraction limit prevents them from accessing length scales beneath 200 nanometres. This is especially problematic for the family of 2D materials, such as graphene and the transition metal dichalcogenides (TMDs), which hold promise for cheap, next-generation LEDs, photovoltaic cells and photodetectors, amongst ...

Transition-metal dichalcogenides such as MoS2 or WS2 are semiconducting materials with a layered structure. One single layer consists of a plane of metal atoms terminated on the top and bottom by the chalcogen atoms sulfur, selenium, or tellurium. These layers show strong in-plane covalent bonding, whereas the Van-der-Waals bonds in between adjacent layers are weak. Those weak bonds allow the microcleavage and extraction of a monolayer. ...

Studying phenomena arising from electron correlations and nontrivial band topology has become one of the most important areas of research in modern solid-state physics. This results in a variety of (new) material types: ferromagnets, superconductors, topological insulators, Mott insulators, Dirac/Weyl semi-metals and anomalous quantum Hall insulators (QAHI). Moreover, when such materials are combined, unique phenomena and functionalities ...

2D-INK is targeted at developing inks of novel 2D semiconducting materials for low-cost large-area fabrication processes on insulating substrates through a new methodology, which will exceed the properties of state-of-the-art graphene- and graphene oxide based inks. Achieving this would represent an important step forward in the processing of 2D semiconducting materials and will provide the key parameters for fabricating the next generation ...