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Institute of Solid State Physics
Processing and characterization of molecular layer deposition (MLD) thin films
Molecular layer deposition (MLD) has gained attention in the past few years as the method-of-choice for the possibility to synthesize (ultra-)thin pinhole-free organic/inorganic hybrid films, the so-called ´metalcones´. MLD enables the deposition of such films with atomic level control over growth, due to its self-limiting nature. By temporally separate the exposure to different organic/inorganic precursors (so-called half-cycles), it is possible to grow monolayer-by-monolayer ultra-thin films with controllable chemistry and excellent conformality
Joanneum Research in Weiz: Biosensors for medical diagnostics
Surfaces suitable for cost-effective large-scale production have to be bio-functionalized with DNA and proteins. After a basic analysis in standard format, the surfaces will be integrated into microfluidic chips and validated.
Joanneum Research in Weiz: Investigation on Laser-Lift-Off for the making of opto-electronic devices
A process for lifting semiconductor layers will be investigated. In particular laser processes will be applied. Those processes will be experimentally tested and the processed material will be characterised in order to evaluate the feasibility of the laser-lift-off for making opto-electronic devices.
Modelling thermal transport in organic semiconductors
Goal: Development of atomistically motivated structure-to-property relationships for heat transport in organic semiconductors – a property, that is crucial for device operation, but is still largely unexplored such that the suggested studies can have a huge impact.
Charge Transfer at Mixed Physisorbed/Chemisorbed Interfaces
Inorganic/Organic interfaces are of great relevant to a large variety of applications, ranging from catalysis and corrosion protection to appliances such as large-area OLED-TVs. Of particular interest is the charge-transfer across the interface, which typically governs the overall performance of the system. Depending on the strength of the interaction between substrate and adsorbate, two archetypes for charge-transfer are commonly observed. For strongly interacting, chemisorbed molecules, new bonds are formed and each molecule at the surface becomes fractionally charged. Conversely, if the interaction is weak, i.e. the molecule physisorbs, some molecules acquire an integer electron while others remain neutral.
The molecule HATCN is a strong electron acceptor that is commercially used in OLEDs to modify the property of metal substrates. Adsorbed on silver, this molecule shows unusual, fascinating physics. At low coverage, the molecule forms honeycomb patterns, which can be exploited as epitaxial growth template. When the coverage is increased, however, the first monolayer rearranges. This drastically changes the material properties, in particular the system’s work function.
Realisation of a grazing incidence in-plane X-ray diffraction (GIXD) setup
Grazing incidence in-plane X-ray diffraction (GIXD) is a powerful technique to solve problems in materials science. First established by Marra et al. (1979) to study crystal surfaces and interfaces, it is now widely used to determine the in-plane order and crystalline properties of thin films. Nowadays, GIXD measurements are mostly performed using synchrotron radiation sources of high brilliance at national or international facilities. However, an increasing interest in GIXD setups in laboratories arose with the emergence of more sophisticated X-ray optics. The goal of this project is the realization of a grazing incidence in-plane X-ray diffraction (GIXD) setup in the laboratory of the Institute of Solid State Physics. The setup is based on a commercial 4-circle diffractometer with a sealed-ceramic copper X-ray tube, upgraded with parabolic graded multilayer X-ray optics and a one-dimensional position sensitive detector. A key feature will be the rotation of the sample during measurement to overcome errors associated with poor statistics. Data will then be collected on model organic thin films at the ELETTRA synchrotron in Trieste, Italy, for comparison with the data collected on the lab instrument. For the software setup and implementation of user-friendly alignment routines, excellent programming skills and a good understanding of X-ray diffraction are required.
Deposition and Characterization of Dielectric Bragg Reflectors
Quantum-Mechanical Modelling of Materials
We are currently seeking Master students to work on on the following topics:
Indizierung von Röntgenbeugungsbildern: Entwicklung numerischer Verfahren für hochtexturierte dünne Schichten
Indizierung von Beugungsbildern bedeutet die Zuordnung von Laue Indizes zu den einzelnen Beugungspeaks. Mit dem Wissen der Indizes kann die kristallographische Einheitszelle bestimmt werden, und ausgehend davon können Kristallstrukturen gelöst werden. Im Rahmen der Arbeit soll eine numerische Routine für die Zuordnung der Laue Indizes entwickelt werden unter Zuhilfenahme analytischer Gleichungen und unter der Vorgabe von Randbedingungen. Das numerische Verfahren ist mittels eines MATLAB- (oder PYTHON-) codes zu realisieren. Diese Arbeit ist ein wichtiger Beitrag für einen international aktuellen Forschungsschwerpunkt zum Thema Kristallstrukturlösung von dünnen Filmen.