Interface shape control using localized heating during Bridgman growth

• Published in: Journal of crystal growth Vol. 311; no. 8; pp. 2321 - 2326
• Main Authors: Volz, M.P., Mazuruk, K., Aggarwal, M.D., Cröll, A.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.04.2009; Elsevier
• Subjects: A1. Computer simulation; A1. Convection; A1. Heat transfer; A1. Interfaces; B2. Bridgman technique; 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; Physics; Solid-solid transitions; Specific phase transitions; Theory and models of crystal growth; physics of crystal growth, crystal morphology and orientation; A1. Heat transfer; A1. Convection; B2. Bridgman technique; A1. Computer simulation; A1. Interfaces; 81.10.Fq; 81.10.−h; Semiconductor materials; Crystallization; Growth interface; Computerized simulation; Heat treatments; Growth mechanism; 87.10.―h; Thermal conductivity; Bridgman method; Heat transfer; 81.10.Fq A1. Computer simulation; Crystal growth from melts
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2009.02.019

Numerical calculations were performed to assess the effect of localized radial heating on the melt–crystal interface shape during vertical Bridgman growth. System parameters examined include the ampoule, melt and crystal thermal conductivities, the magnitude and width of localized heating, and the latent heat of crystallization. Concave interface shapes, typical of semiconductor systems, could be flattened or made convex with localized heating. Although localized heating caused shallower thermal gradients ahead of the interface, the magnitude of the localized heating required for convexity was less than that which resulted in a thermal inversion ahead of the interface. A convex interface shape was most readily achieved with ampoules of lower thermal conductivity. Increasing melt convection tended to flatten the interface, but the amount of radial heating required to achieve a convex interface was essentially independent of the convection intensity.