Several samples of thin-film silicon grown on oxidized Si, both oxidized and unoxidized, have been examined using spectroscopic ellipsometry (SE) and constant angle reflection interference spectroscopy (CARIS). The SE data was fit to 5- or 6- layer models of the sample near-surface region, using the optical functions of thin-film silicon determined from a previous work. Reasonable fits were obtained from samples containing amorphous Si (a-Si) or large-grain poly-crystalline Si (p-Si), but fits to samples containing small-grain, undoped p-Si were poor unless a 8–15 nm surface roughness layer is included. Furthermore, the optical functions of p-Si:ud are not consistent from sample to sample. The optical functions determined from SE measurements were then used to interpret CARIS measurements, extracting the thicknesses of the films, which are then compared with the thicknesses obtained from SE.
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The authors would like to thank P. H. Fleming for sample preparation. This research was sponsored by the Division of Materials Sciences, U. S. Department of Energy under Contract DE-AC05-84OR21400 with Martin Marietta Energy Systems, Inc.
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Jellison, G.E., Keefer, M. & Thornquist, L. Spectroscopic Ellipsometry and Interference Reflectometry Measurements of CVD Silicon Grown on Oxidized Silicon. MRS Online Proceedings Library 283, 561–566 (1992). https://doi.org/10.1557/PROC-283-561