Vibrational spectroscopy of SiC thin films deposited by excimer laser ablation |
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Authors: | H Hobert HH Dunken G Peiter W Stier M Diegel H Stafast |
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Institution: | Institut für Physikalische Chemie, Friedrich-Schiller-Universit?t Jena, Lessingstr. 10, D-07743 Jena, Germany (Fax: +49-03641/948-302, E-mail: hobert@adele.chemie.uni-jena.de), DE Institut für Physikalische Hochtechnologie e.V., Helmholtzweg 4, D-07743 Jena, Germany, DE
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Abstract: | A large number of thin SiC films, prepared at different conditions by KrF excimer laser ablation of solid SiC targets and
deposition onto Si substrates (some onto quartz glass (QG) and yttrium-stabilized zirconia (YSZ)) were characterized by infrared
and Raman spectroscopy. The films consisted of nano- and microcrystalline SiC and contained nanocrystalline carbon in the
case of QG or YSZ substrates. Raman spectra of nanocrystalline SiC (grains <30 nm) reflect the phonon density-of-state function
of SiC by broad scattering effects at 220–600 and 650–950 cm−1. Medium-size crystallites are represented by a relatively narrow asymmetric band at 790 cm−1 and crystallites >200 nm by an additional asymmetric band at 960 cm−1. Small satellite bands at 760 and 940 cm−1, attributed to SiC surface layers, were resolved in some well-ordered samples. Optical modelling was needed to interpret
the IR spectra. SiC films could be represented by an effective medium model containing a SiC host phase and embedded particles
with free charge carriers. The crystalline order of SiC films can be estimated from the parameters of the SiC oscillators.
Received: 5 October 1998 / Accepted: 8 January 1999 / Published online: 5 May 1999 |
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Keywords: | PACS: 68 55+b 78 30-j 78 65-s |
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