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001     1028934
005     20250204113912.0
024 7 _ |a 10.1111/jace.19951
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024 7 _ |a 1551-2916
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024 7 _ |a 10.34734/FZJ-2024-04877
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100 1 _ |a Stern, Christian
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245 _ _ |a Correlative characterization of plasma etching resistance of various aluminum garnets
260 _ _ |a Westerville, Ohio
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520 _ _ |a Plasma etching is a crucial step in semiconductor manufacturing. High cleanliness and wafer-to-wafer reproducibility in the etching chamber are essential in order to successfully achieve nanometer-sized integrated functions on the wafer. The trend toward the application of more aggressive plasma compositions leads to higher demands on the plasma resistance of the materials used in the etching chamber. Due to its excellent etch resistance, yttrium aluminum garnet Y3Al5O12 (YAG) is starting to replace established materials like SiO2 or Al2O3 in this kind of application. In this study, reactive spark plasma sintering (SPS) was used to manufacture highly dense YAG ceramics from the respective oxides. In addition, yttrium was replaced with heavier lanthanoids (Er, Lu), intending to investigate the role of the A-site cation in the garnet type structure on the plasma erosion behavior. The produced materials were exposed to fluorine-based etching plasmas mimicking the conditions in the semiconductor manufacturing apparatus and the erosion behavior was characterized by atomic force microscopy (AFM), secondary ion mass spectrometry (SIMS), transmission electron microscopy (TEM), and profilometry. The induced chemical gradient in the samples is limited to a few nanometers below the surface, which makes its characterization challenging. For advanced analysis, we developed a correlative characterization method combining SIMS and scanning TEM (STEM)–energy-dispersive spectroscopy (EDS) enabling us to examine the structural and chemical changes in the reaction layer locally resolved. In the case of lanthanoid aluminates, an altered reaction layer and reduced fluorine penetration compared to YAG were found. However, a correlation between the characteristics of the induced chemical gradient and the determined physical erosion rates was not evident.
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700 1 _ |a Schwab, Christian
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700 1 _ |a Kindelmann, Moritz
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700 1 _ |a Stamminger, Mark
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700 1 _ |a Weirich, Thomas
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700 1 _ |a Park, Inhee
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