TY - GEN A1 - Schmieder, Benjamin A1 - Döhler, Torsten A1 - Rolle, Siegfried A1 - Ruede, Frank A1 - Schurig, Thomas A1 - Ketelsen, Helge A1 - Gruska, Bernd T1 - Photoscanning-Verfahren zur nichtinvasiven Charakterisierung fabrikationsbedingter Defekte in Solarzellen T2 - Wissenschaftliche Beiträge 2013 N2 - Das Photoscanning-Verfahren dient der zerstörungsfreien Detektion von Defekten in Solarzellen. Die Daten ermöglichen Rückschlüsse auf grundlegende physikalische Parameter der Zelle, wie zum Beispiel den Wirkungsgrad, bzw. mechanische Störungen. Es erlaubt eine umfassende Charakterisierung einer Vielzahl von unterschiedlichen Solarzellentypen. Innerhalb des Projektes werden diese Einsatzmöglichkeiten des Photoscanning-Verfahren verifiziert. Seit 2011 wurde die Weiterentwicklung des Verfahrens innerhalb einer Kooperation mit der Firma SENTECH als Projektträger, der Physikalisch Technischen Bundesanstalt und der TH Wildau als Projektbeteiligte fortgesetzt. Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-3230 SN - 0949-8214 VL - 17 SP - 43 EP - 48 ER - TY - CHAP A1 - Döhler, Torsten A1 - Böhme, Andrea A1 - Hofmann, Mandy A1 - Neumann, Jens A1 - Bochem, Reinhard A1 - Foitzik, Andreas A1 - Geißler, Ute T1 - Mikrogalvanische Kennzeichnung als Kopierschutz T1 - Electroplated Micro-Labelling as Copy Protection T2 - Open Conference Proceedings N2 - In order to achieve good product quality in electroplating, disturbance variables such as the "dog bone" effect must be avoided. In this work, this approach was used to develop a method for marking as product protection. With a defined structure and optimal parameters, it is possible to deposit unique visually non-differentiable layers on suitable substrates. The deposited layers and their local distribution were characterized by confocal laser microscopy, X-ray fluorescence analysis and laser interference measurements and analyzed qualitatively as well as quantitatively. It thus provides interested parties with an essentially traditional process that can lead to new innovations with the chosen approach. N2 - Um eine gute Produktqualität in der Galvanik zu erreichen, müssen Störgrößen wie zum Beispiel der "Hundeknochen"-Effekt vermieden werden. In dieser Arbeit wurde dieser Ansatz genutzt, um eine Methode zur Kennzeichnung als Produktschutz zu entwickeln. Mit definiertem Aufbau und optimalen Parametern ist es möglich, auf geeigneten Substraten, unikale visuell nicht differenzierbare Schichten abzuscheiden. Die abgeschiedenen Schichten und deren lokale Verteilung wurden mit Hilfe konfokaler Lasermikroskopie, Röntgenfluores-zenzanalyse und Laserinterferenzmessungen charakterisiert und qualitativ als auch quantitativ analysiert. Interessenten stellt es damit ein im Grunde traditionelles Verfahren zur Verfügung, das mit dem gewählten Ansatz zu neuen Innovationen führen kann. Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-17624 VL - 2 SP - 157 EP - 161 PB - TIB Open Publishing ER - TY - JOUR A1 - Felke, Florens A1 - Groth, Anne A1 - Hempel, Martin A1 - Czerny, Bernhard A1 - Khatibi, Golta A1 - Döhler, Torsten A1 - Geißler, Ute T1 - Effect of the loop forming process on the lifetime of aluminum heavy wire bonds under accelerated mechanical testing JF - Microelectronics Reliability N2 - Heavy wire bonding is one of the most common interconnection technologies in manufacturing of high-power electronics. For industrial applications, the long-term reliability of these connections is crucial. Besides the selection of the wire material and the loop geometry itself, the loop forming process parameters also have an influence on the reliability of the wire bond. In this work, the influence of the backward bond head movement during wire bonding process on the quality of wire bond connections was systematically investigated and qualified by cyclic mechanical lifetime tests, surface roughness measurements of the heel area by laser confocal microscopy and static pull tests. The wire bond loops were fabricated with 300 μm aluminum H11 and H14CR wires with different hardness values. The lifetime at low frequency cycle and high frequency cycle regime was determined by means of two different mechanical cyclic test methods operating at 5 Hz and at 60 kHz respectively. The results have shown, that the surface topology of the heel region caused by the initial plastic deformation during the loop forming process has a significant effect on the wire bond failure due to heel cracking. The number of loading cycles to failure shows an inverse correlation with the degree of surface roughness in a so called wrinkling analysis in the low and high frequency cycle regime. The soft wire exhibits different lifetimes compared to the hard ones depending on the testing conditions, while a significant decrease of the lifetime is observed with >30 % reverse movement during bonding in all cases. KW - aluminum heavy wire bonding KW - mechanical accelerated lifetime testing method KW - heel crack KW - loop forming process KW - wrinkling Y1 - 2024 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-18631 VL - 154 PB - Elsevier ER - TY - CHAP A1 - Hauschultz, Mike A1 - Friedo, Maria H. A1 - Döhler, Torsten A1 - Böhme, Andrea A1 - Richetta, Maria A1 - Foitzik, Andreas ED - Stolzenburg, Frieder ED - Reinboth, Christian ED - Lohr, Thomas ED - Vogel, Kathleen T1 - Additive Manufacturing of Electrodes: Innovative Applications and Opportunities T2 - NWK 2023 - Tagungsband zur 23. Nachwuchswissenschaftler*innenkonferenz N2 - Additive manufacturing, also known as 3D printing, has gained tremendous importance in recent years. One of the areas where additive manufacturing is particularly useful is in the fabrication of electrodes. Electrodes are an important component of a wide range of applications, including electrochemistry, biomedical engineering, energy storage, analytics, electronics as well as life sciences. Traditionally, electrodes have been manufactured through costly processes such as etching, electroplating or cutting and milling. Additive manufacturing offers a new way to fabricate electrodes by depositing materials layer by layer (Yap et al., 2015). This opens up new possibilities for designing electrodes with complex geometries and structures that would not be possible using conventional methods. As a result, 3D printed electrodes are gaining interest in fields such as electromobility, water disinfection, manufacturing, and life sciences, which will be presented in this paper. Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-18621 UR - https://www.hs-harz.de/nwk2023/tagungsband-nwk-2023 UR - https://www.hs-harz.de/dokumente/extern/Forschung/NWK2023/Beitraege/Additive_Manufacturing_of_Electrodes_-_Innovative_Applications_and_Opportunities.pdf SN - 2627-5708 SP - 292 EP - 297 PB - Hochschule Harz CY - Wernigerode ER - TY - CHAP A1 - Friedo, Maria H. A1 - Hauschultz, Mike A1 - Döhler, Torsten A1 - Böhme, Andrea A1 - Richetta, Maria A1 - Foitzik, Andreas ED - Stolzenburg, Frieder ED - Reinboth, Christian ED - Lohr, Thomas ED - Vogel, Kathleen T1 - Sustainable production of injection moulds through additive manufacturing and improved application of energy management T2 - NWK 2023 - Tagungsband zur 23. Nachwuchswissenschaftler*innenkonferenz N2 - The concept of this thesis is to optimize the manufacturing process of injection moulding tools by using additive manufacturing and thus contribute to environmental protection. For this purpose, the individual steps of the traditional manufacturing process are identified and analysed to determine which steps can be replaced by additive manufacturing. The first step is to clarify which mould components can benefit from additive manufacturing. In particular, the capabilities and limitations of additive manufacturing technologies must be considered. Furthermore, another focus is on how to optimize the cooling and temperature control of the tools. Potential savings through the use of lightweight or insulating surfaces will be examined. In addition to the technical feasibility, the cost-effectiveness of the concept will also be considered. Finally, the contribution of the concept to the reduction of the environmental impact will be evaluated. In particular, energy savings and the reduction of CO2 emissions are taken into account. The potential to optimize the injection mould manufacturing process and reduce environmental impact is significant. Using additive manufacturing can be an economic and environmental advantage. Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-18600 UR - https://www.hs-harz.de/nwk2023/tagungsband-nwk-2023 UR - https://www.hs-harz.de/dokumente/extern/Forschung/NWK2023/Beitraege/Sustainable_production_of_injection_moulds_through_additive_manufacturing_and_improved_application_of_energy_management.pdf SN - 2627-5708 SP - 298 EP - 302 PB - Hochschule Harz CY - Wernigerode ER - TY - JOUR A1 - Tarabrin, Mikhail K. A1 - Bushunov, Andrey A. A1 - Teslenko, Andrei A. A1 - Sakharova, Tatiana A1 - Hinkel, Jonas A1 - Usenov, Iskander A1 - Döhler, Torsten A1 - Geißler, Ute A1 - Artyushenko, Viacheslav A1 - Lazarev, Vladimir A. T1 - Fabrication of an antireflection microstructure on AgClBr polycrystalline fiber by single pulse femtosecond laser ablation JF - Optical Materials Express N2 - Polycrystalline infrared (PIR) fibers are used for numerous applications, one of those being power delivery for CO2 lasers. However, the fiber tip surface's transmittance cannot be increased with conventional antireflection coatings due to the surface unevenness. Antireflection microstructures (ARMs) offer an alternative way of increasing transmittance. In this work, ARMs were fabricated on the fiber tip surface of an AgClBr fiber by single-pulse femtosecond laser ablation. A single-surface transmittance of 92.8% at 10.6 μm, a CO2 laser operation wavelength, was achieved. The proposed method can help significantly improve the systems' efficiency, where power delivery for CO2 lasers or sources operating in the wide wavelength range is required. Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-15384 VL - 11 IS - 2 SP - 487 EP - 496 PB - Optical Society of America ER - TY - JOUR A1 - Böhme, Andrea A1 - Döhler, Torsten A1 - Hofmann, Mandy A1 - Neumann, Jens A1 - Bochem, Reinhard A1 - Geißler, Ute A1 - Foitzik, Andreas T1 - Electrolytical Coating of Inhomogeneous Structures Distributed on Metallic Surfaces JF - Materials Science Forum N2 - In modern electrochemical coating technology, it is common practice to create uniform layers. However, this study focuses on the deposition of non-uniform layers achieved through a deliberate arrangement of micro structured electrodes on the anode side. The "dog bone effect” was employed as the primary approach [1]. When electroplating on an otherwise uniform surface, this effect selectively processes an area influenced by the geometric edge effect (figure 1 left). The coating within this area is intended to be (i) unevenly distributed and (ii) non-reproducible. Process data was obtained through electrochemical simulations and subsequently applied to a specially designed micro-galvanic setup. This enabled the production of suitable micro structured anodes, validation of coating parameters, and the deposition of visually imperceptible structured areas with inhomogeneous properties using "adhesive gold" on appropriate substrates such as silver and nickel. The layers and their local topography were characterized and analyzed using confocal laser microscopy, X-Ray fluorescence analysis (XRF), as well as a self-designed and constructed laser interference device. As a result, this specific galvanic process technology successfully produced metallic layers that (i) cannot be visually confirmed by the naked eye, (ii) exhibit varied microstructural anode geometries, (iii) display unique differences in layer thickness, (iv) possess non-reproducible and chaotic topographies, and (v) can be detected and identified using conventional analysis techniques or a simple interference setup. KW - cathode KW - anode KW - micro-galvanic corrosion KW - electrochemical KW - interferometric KW - sub microstructure KW - dog bone effect Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-18825 SN - 0255-5476 SN - 1662-9752 VL - 1106 SP - 75 EP - 80 PB - Trans Tech Publications ER - TY - JOUR A1 - Adomavičiũtė-Grabusovė, Sonata A1 - Hinkel, Jonas A1 - Usenov, Iskander A1 - Novikov, Alexander S. A1 - Sakharova, Tatiana A1 - Döhler, Torsten A1 - Geißler, Ute A1 - Feliksberger, Elena A1 - Artyushenko, Viacheslav T1 - Microstructuring of the end-surface for silver halide polycrystalline fibers to suppress Fresnel reflection JF - Optical Materials Express N2 - Silver halide polycrystalline infrared fibers (PIR) have unique properties such as excellent transmittance in the spectral range from 3 to 17 µm, while also being highly flexible, non-toxic, and non-hygroscopic. They are used in industry and medicine for CO2-laser power delivery, flexible infrared imaging, and remote process spectroscopy. While PIR fibers possess a quite low attenuation (0.1-0.5 dB/m) in the 8-12 µm range, their total transmittance is limited by significant Fresnel reflections at the fiber end faces due to the high refractive index of silver halide (>2.1). Functionalization of these surfaces with specially designed Anti-Reflective Microstructures (ARMs) enables a striking enhancement of fiber transmittance. In this work, direct imprinting (or embossing) of microstructures to fiber ends and their profiling with a microstructured knife was applied to fabricate such ARMs. The resulting two-dimensional Moth-eye microstructures and one-dimensional microgrooves at the PIR-fiber ends enable to an increase of fiber transmittance in a broadband range of (5-17 µm) as well as to reach up to 20% improvement for PIR-fiber laser cables used for power delivery of CO2-lasers at 10.6 µm. KW - effective refractive index KW - fresnel reflection KW - infrared fiber KW - infrared imaging KW - quantum cascade semiconductor laser KW - refractive index Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-15549 VL - 12 IS - 1 SP - 34 EP - 48 PB - Optica Publishing Group ER -