Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster: Crystallisation, Nucleation and Self assembly
CPP 17.19: Poster
Dienstag, 27. März 2012, 18:15–20:15, Poster A
IR spectroscopic studies on SiO condensation — •Steffen Wetzel and Annemarie Pucci — Kirchhoff-Institut für Physik, INF 227, 69121 Heidelberg
Silicon oxides used to be relevant as gate oxides in microelectronics and are of great importance in astronomy as building blocks of silicates, the most abundant minerals in space. The IR spectral feature of the Si-O stretching vibration strongly depends on the chemical composition and on the formation conditions. We studied the growth of thermally evaporated SiO on clean Si(111)7x7 at room temperature and found a strong shift of the resonance frequency for the first stage of film growth indicating the formation of an SiOx (0≤ x ≤ 1) interlayer. Condensation experiments at substrate temperatures between 40 K and 470 K reveal as well a clear shift of the resonance frequency, indicating gradual disproportination of SiO into Si and SiO2 for the higher temperatures. Both effects will be discussed in detail and be presented along with details on the experimental setup.