Japanese Journal of Applied Physics · 1992 · 44 citations · 11 references
Natural SciencesChemistryMaterials ScienceInorganic ChemistryPhysical ChemistryReaction EngineeringAtmospheric Oxidation ProcessesChemical Vapor DepositionOzone ChemistryAtmospheric PressureAtmospheric Pressure Chemical Vapor DepositionChemical Vapor Deposition PrecursorsDeposition RateFlow DirectionFourier Transform Infrared SpectroscopyOzoneSticking Probability
The decomposition process of tetraethylorthosilicate (TEOS) and ozone at atmospheric pressure was measured in a closed vessel by in-situ Fourier-transform infrared absorption (FT-IR) analysis, and the changes of the deposition rate and the overall sticking probability β of the film precursor were obtained along the flow direction in a flow-type reactor. It has been found that the film precursors are formed by TEOS decomposition with O-atoms and/or ozone in the gas phase, and that CH 3 CHO may be the first product, followed by the oxidation to CO 2 and H 2 O via HCHO. It is also shown that the film quality changes along the flow direction, that is, O-H bonds in the film decrease and the β-value increases as the reaction proceeds. These results may show that there are several kinds of precursors, and the sticky (unstable) precursors become dominant in the later stages.
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