On the quasi-steady-state assumption in modeling Czochralski crystal growth
1988; Elsevier BV; Volume: 87; Issue: 2-3 Linguagem: Inglês
10.1016/0022-0248(88)90172-8
ISSN1873-5002
AutoresJeffrey J. Derby, Robert A. Brown,
Tópico(s)Crystallization and Solubility Studies
ResumoThe validity of the quasi-steady-state (QSS) assumption for describing conventional Czochralski crystal growth is addressed by a scaling analysis and by comparisons of numerical calculations for a QSS thermal-capillary model with results from a transient model which includes all of the dynamics associated with the growth process. The QSS model fails to accurately predict the operating states during batchwise growth when the crystal shape changes appreciably. However, the quasi-steady-state assumption is valid for describing growth runs where crystal diameter control is successfully implemented. An approximate correction for the time-averaged growth rate improves the agreement between QSS and fully transient predictions.
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