Melt zone growth of Ge-rich Ge1−xSix bulk crystals

• Published in: Journal of crystal growth 2013-08, Vol.377, p.147-152
• Main Authors: Kostylev, I., Woodacre, J.K., Lee, Y.P., Klages, P., Labrie, D.
• Format: Article
• Language: English
• Subjects: A1. Segregation; A1. Solidification; A2. Melt zone growth; A2. Single crystal growth; B1. Germanium silicon alloys; B2. Semiconducting silicon alloys; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; 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; Phase diagrams of metals and alloys; Physics; Solubility, segregation, and mixing; phase separation; Theory and models of crystal growth; physics of crystal growth, crystal morphology and orientation
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2013.05.012

Melt zone growth of Ge-rich SiGe alloy was performed on 24mm diameter by >90mm long feedrods using a resistive furnace. The Si composition along the growth axis of one sample showed a trend where the composition first rapidly decreased, then smoothly transitioned into a plateau-like region, and finally dropped in a Bridgman-like manner near the end of processing. A simple one-dimensional model including full mixing of the melt constituents and an equilibrium Si segregation coefficient given by the phase diagram of SiGe was used to explain the results. The model is in good agreement with the Si composition profile along the growth axis. •Melt zone growth of Ge-rich SiGe alloy was performed on large diameter feedrods.•Axial Si composition along the growth axis is typical of melt zone growth.•Simple 1D melt zone model was used to explain the results.•Full mixing within the melt zone and the equilibrium k was used in the model.•Good agreement between theory and experiment was obtained for two samples.