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TRR 87:  Pulsed High Power Plasmas for the Synthesis of Nanostructural Functional Layers

Subject Area Computer Science, Systems and Electrical Engineering
Chemistry
Mechanical and Industrial Engineering
Materials Science and Engineering
Physics
Term from 2010 to 2022
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 138690629
 
Final Report Year 2023

Final Report Abstract

Fundamental phenomena in high power pulsed plasmas used for coating by magnetron sputtering of ceramic layers and by plasma enhanced chemical vapor deposition (PECVD) of SiO2 barrier and membrane layers have been elucidated by a combination of very detailed experiments combined with theory and simulation. In the field of pulsed magnetron plasmas, dynamic ionization zones favoring plasma transport from the target to the substrate were observed and characterized. The mechanism of action was identified by synchronized measurements consistent with theory and simulation. Scaling to large industrial facilities was demonstrated. Large-scale multifrequency plasmas were set up for the deposition of ceramic coatings, quantitatively characterized and simulated, and ultimately optimized. In the process, the coupling of the different frequencies and the spatial expansion of the plasmas were elucidated in alignment with simulation and theory. Finally, by screening the correlation between plasma properties and layer properties, it was possible to develop extended structure zone diagrams. In the field of PECVD and plasma enhanced atomic layer deposition (PE-ALD), the entire chain from substrate pretreatment, deposition of an intermediate layer and deposition of the actual barrier layer was elucidated and described in detail. Many, often quantitative, individual experiments were able to dispel a number of ideas previously assumed to be valid, re-evaluate them and integrate them into the overall process. Building on the wealth of experience, it was also possible in the final phase to realize the process of depositing membrane layers, which is the inverse of barrier deposition. This also succeeded exceptionally well and quickly due to the quantitative characterization of all relevant parameters. As gas separation seems to play an increasingly important role, the foundations for many further research projects were laid here.

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