Abstract
A numerical model of a fluidized bed reactor was developed for estimating rates of CVD and fines formation in polycrystalline silicon production from monosilane. In the model, Kunii-Levenspiel fluidized bed model and reaction kinetics were combined. The model predicts both the homogeneous decomposition to give fine powder and the heterogeneous CVD on seed silicon particles. The relative and quantitative contributions of both reactions were elucidated in fluidized bed bubbling zone including both bubble and emulsion phases. The present model also predicts the effects of operational conditions on the rates. The numerical values were compared with experimental data by ourselves and Hsu et al. The results indicated that fines mainly form in the bubble phase.
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