Estimation of liquid phase diffusion coefficients of gallium and antimony in germanium from segregation data in crystal growth experiments

• Published in: Journal of crystal growth 2008-07, Vol.310 (14), p.3268-3273
• Main Author: Garandet, J.P.
• Format: Article
• Language: English
• Subjects: A1. Diffusion; A1. Fluid flows; A1. Segregation; A2. Czochralski method; B1 Germanium–silicon alloys; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Diffusion and ionic conduction in liquids; Diffusion and thermal diffusion; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Growth from melts; zone melting and refining; Materials science; Methods of crystal growth; physics of crystal growth; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Solidification; Solubility, segregation, and mixing; phase separation; Transport properties of condensed matter (nonelectronic)
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2008.03.042

The objective of this paper is to propose new determinations of the diffusion coefficients of gallium and antimony in liquid germanium. To do so, an analysis of effective segregation coefficients obtained in Czochralski growth experiments is carried out in the frame of a self-consistent solidification model. As such, the deduced diffusivity values should be taken as more reliable than previously published data based on the analysis of solute segregation profiles, but the accuracy of the technique is limited by the scatter of the composition measurements. Comparison with existing data supports the necessity of setting up a dedicated experimental program for the measurement of liquid phase diffusion coefficients in germanium.