Dokument-ID Dokumenttyp Autoren/innen Persönliche Herausgeber/innen Haupttitel Abstract Auflage Verlagsort Verlag Herausgeber (Institution) Erscheinungsjahr Titel des übergeordneten Werkes Jahrgang/Band ISBN Veranstaltung Veranstaltungsort Beginndatum der Veranstaltung Enddatum der Veranstaltung Ausgabe/Heft Erste Seite Letzte Seite URN DOI Lizenz Datum der Freischaltung OPUS4-54242 Zeitschriftenartikel Ernst, O. C.; Böttcher, K.; Fischer, Daniel; Uebel, D.; Teubner, T.; Boeck, T. Morphogenesis of liquid indium microdroplets on solid molybdenum surfaces during solidification at normal pressure and under vacuum conditions Electrical and optical applications based on micro- and nanoparticles have specific demands on their interfacial properties. These properties are strongly related to atmospheric conditions to which the particles were exposed during their formation. In this study, metallic In microparticles are synthesized by solidification of In droplets on an amorphous Mo substrate at normal pressure and under vacuum conditions. The influence of ambient pressure on the interface and surface shape is investigated. While solidification at atmospheric pressure leads to collapsed particles with undisturbed contact to the substrate, low pressures result in smooth spherical particles but with cavities inside. Numerical simulations with COMSOL Multiphysics reveal different temperature profiles and heat flux in particles during solidification for both cases. This indicates different starting conditions of the solidification, which leads to the described phenomenon eventually. The investigation of the varying process conditions on the particle shape in combination with the calculated and measured temperature curves over time gives valuable insights into new approaches to synthesize micro- and nanoparticles with defined interfacial properties. Both ambient pressure and cooling rate provide well-controllable and reliable parameters for the realization of different interfacial shapes. Washington, DC ACS Publ. 2022 Langmuir 38 2 762 768 10.1021/acs.langmuir.1c02744 2022-01-21 OPUS4-35602 Zeitschriftenartikel Ringleb, F.; Eylers, K.; Teubner, T.; Boeck, T.; Symietz, Christian; Bonse, Jörn; Andree, Stefan; Krüger, Jörg; Heidmann, B.; Schmid, M.; Lux-Steiner, M. Regularly arranged indium islands on glass/molybdenum substrates upon femtosecond laser and physical vapor deposition processing A bottom-up approach is presented for the production of arrays of indium islands on a molybdenum layer on glass, which can serve as micro-sized precursors for indium compounds such as copper-indium-gallium-diselenide used in photovoltaics. Femtosecond laser ablation of glass and a subsequent deposition of a molybdenum film or direct laser processing of the molybdenum film both allow the preferential nucleation and growth of indium islands at the predefined locations in a following indium-based physical vapor deposition (PVD) process. A proper choice of laser and deposition parameters ensures the controlled growth of indium islands exclusively at the laser ablated spots. Based on a statistical analysis, these results are compared to the non-structured molybdenum surface, leading to randomly grown indium islands after PVD. AIP Publishing LLC 2016 Applied Physics Letters 108 11 111904-1 111904-4 10.1063/1.4943794 2016-03-30 OPUS4-40551 Zeitschriftenartikel Ringleb, F.; Eylers, K.; Teubner, T.; Schramm, H.-P.; Symietz, Christian; Bonse, Jörn; Andree, Stefan; Heidmann, B.; Schmid, M.; Krüger, Jörg; Boeck, T. Growth and shape of indium islands on molybdenum at micro-roughened spots created by femtosecond laser pulses Indium islands on molybdenum coated glass can be grown in ordered arrays by surface structuring using a femtosecond laser. The effect of varying the molybdenum coated glass substrate temperature and the indium deposition rate on island areal density, volume and geometry is investigated and evaluated in a physical vapor deposition (PVD) process. The joined impact of growth conditions and spacing of the femtosecond laser structured spots on the arrangement and morphology of indium islands is demonstrated. The results yield a deeper understanding of the island growth and its precise adjustment to industrial requirements, which is indispensable for a technological application of such structures at a high throughput, for instance as precursors for the preparation of Cu(In,Ga)Se2 micro concentrator solar cells. Amsterdam Elsevier B.V. 2017 Applied Surface Science 418 548 553 10.1016/j.apsusc.2016.11.135 2017-06-13