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Coating and drying processes for functional films in polymer solar cells - from laboratory to pilot scale
Polymer solar cells can be produced by a continuous low cost coating and drying process. This work details a specialized experimental set-up to enable large scale roll to roll processing. Material properties such as surface energy, surface tension, and viscosity are presented and modelled. The impact of coating method, as well as process parameters (e.g. coating speed, shear rate, solvent composition) on process stability and film properties, is discussed.
A blend of MaLT
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Slot die coating of lithium-ion battery electrodes
The Li-ion battery technology could help to accelerate the transition towards renewable energy sources. In the manufacturing chain, the electrode processing by slot die coating is one of the most crucial steps. Increased line speeds and reduced scrap rates could help decrease these costs. The scope of this work is therefore the scientific elaboration of the process limits of single and subdivided, simultaneous coated multilayer films, a minimizing of edge effects and intermittent coatings.
In Situ Characterization and Modelling of Drying Dynamics for Scalable Printing of Hybrid Perovskite Photovoltaics
Hybrid perovskite photovoltaics could play a vital role in future’s renewable energy production. However, there are still severe challenges when scaling the technology. In this work, perovskite solution films drying in laminar and slot-jet air flows are investigated extensively by optical in situ characterization. The main results are a quantitative model of perovskite drying dynamics and a novel in situ imaging technique – yielding valuable predictions for large-scale perovskite fabrication.
Fluessigprozessierung von Multischicht-OLEDs aus kleinen Molekuelen
Organic light-emitting diodes consist of several layers of organic molecules just a few nanometers thick. In future, it may become possible to change the manufacturing process from vacuum deposition to a cost-effective liquid processing. This theoretical and practical investigation focuses on the underlying processes, in particular coating and drying, as well as the factors influencing the separation of individual layers in multilayer systems consisting of small molecules.
Zur Loesemitteldiffusion in Polymernanoschichten: Schichtdicken- und Konzentrationsabhaengigkeit
Solution-casted polymer nanolayers are part of many technical applications. The solvent mass transport parameters are often unknown. However, they are a decisive factor for the determination of drying times, amounts of trace solvent, long-term stability and multilayer intermixing. By setting up a measurement system and conducting experimental and numerical investigations the difference in mass transport characteristics in micro- to nanoscale polymer layers is shown.
Ki: Text
Wenn Künstliche Intelligenz (KI) Texte generieren kann, was sagt das darüber, was ein Text ist? Worin unterscheiden sich von Menschen geschriebene und mittels KI generierte Texte? Welche Erwartungen, Befürchtungen und Hoffnungen hegen Wissenschaften, wenn in ihren Diskursen KI-generierte Texte rezipiert werden und Anerkennung finden, deren Urheberschaft und Originalität nicht mehr eindeutig definierbar sind? Wie verändert sich die Arbeit mit Quellen und welche Konsequenzen ergeben sich daraus für die Kriterien wissenschaftlicher Textarbeit und das Verständnis von Wissenschaft insgesamt? Welche Chancen, Grenzen und Risiken besitzen KI-Textgeneratoren aus Sicht von Technikethik und Tech...
Immigration Dialectic
Immigration is an integral part of national identity in settler societies such as Canada. But in countries where identity is defined more in ethnic terms, such as Germany, the presence of immigrants has only recently begun to be acknowledged. Taking these two countries as case studies, Immigration Dialectic explores the impact of immigration on national identity as imagined through media-based discourse. Harald Bauder argues that while both countries rely on negative depictions of immigrants to construct a positive image of the self, the ways in which Canada and Germany construct national identity in relation to representations of immigrants are significantly different. Bauder introduces a sophisticated framework of Hegelian dialectics for the growing interdisciplinary literature regarding media perspectives on immigration and national identity. Providing close analysis of themes such as belonging, economic impacts, and national security, Immigration Dialectic will appeal to anyone interested in contemporary discussions on immigration.
