Characterisation of thin sputtered silicon nitride films by NRA, ERDA, RBS and SEM |
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Authors: | A Markwitz H Baumann E F Krimmel K Bethge and P Misaelides |
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Institution: | (1) Institut für Kernphysik, J. W. Goethe-Universität, W-6000 Frankfurt a. M. 90, Germany;(2) Department of General and Inorganic Chemistry, Aristotle University, GR-54006 Thessaloniki, Greece |
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Abstract: | Summary Thin, amorphous silicon nitride (a-SINx) films were deposited on n-type (100) silicon substrates using an argon ion beam for sputtering a HPSN block under high vacuum conditions. The substrates were kept at room temperature. Nitrogen depth distributions were determined by NRA using the resonance reaction 15N(p,![agr](/content/h77173j677115428/xxlarge945.gif) )12C at 429 keV. Hydrogen profiles were analysed by NRA (1H(15N,![agr](/content/h77173j677115428/xxlarge945.gif) )12C at Eo=6.385 MeV) and by ERDA (20Ne2+, Eo=10 MeV). The NRA was used to determine the depth distributions (concentration vs. areal density) of nitrogen and hydrogen taking calibration standards into consideration. The silicon depth distributions and the N/Si ratios of the deposited a-SiNx films were determined by RBS (4He+, Eo=2.0 MeV). Film thicknesses were obtained by SEM. The density of the deposited a-SiNx films was found to be =2.7 (±0.1) g/cm3 by correlating RBS data and real film thicknesses as obtained by SEM. |
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