Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8150985 | Journal of Crystal Growth | 2014 | 7 Pages |
Abstract
Striations were observed in crystals grown without or too strong TMF. Almost no micro-inhomogeneities were detected when the magnetic flux densities of the TMF were matched to progression of solidification. With utilized TMF, induced melt flow opposed natural convection driven by buoyancy forces. Axial dopant incorporation was enhanced through a reduction of flow velocities and converging melt flow towards the center of the solid-liquid interface. The radial segregation profiles were flattened through a reduction of the concave deflection. While low frequency TMF bended the interface center more convex, the effect of high frequency TMF was more limited to the melt periphery. Furthermore, with large high frequency TMF current shares the impact of the minor three-dimensional asymmetric magnetic field distribution in the HMM became more relevant. Consequently, the application of double-frequency TMF led to a reduction of etch pit density through reduction of interface concavity.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Alexander Glacki, Natasha Dropka, Christiane Frank-Rotsch, Uta Juda, Martin Naumann,