Journal article

Publication year: 2020

Journal: Crystal Research & Technology

Volume number: 55

Issue number: 2

ISSN: 0232-1300

eISSN: 1521-4079

Open access status: Hybrid

DOI Link: https://doi.org/10.1002/crat.201900073

Publisher: Wiley

Abstract: 
Herein, the features of some Czochralski crystals with spiral morphology are investigated in detail to develop a model for their spiral growth. The case of a cylindrically growing crystal with a spontaneous transition to spiral growth is considered. At the onset of spiral growth, the development of a "foot" in the meniscus region is identified. It is shown that the growth of a foot takes place under "flaring growth conditions." Insufficient axial heat transport through the crystal leads to a concave interface which is behind the flaring growth. The constraints of automatic weight control force the flaring crystal to grow as a spiral. The selection of a single foot is assisted by temperature fluctuations in the melt. Some symmetry breakings during spiral growth, for example, a meniscus deformation by rotation and the azimuthal growth in the meniscus, have been described already by the author earlier. Only recently spiral growth has been encountered with Czochralski silicon, grown at high pulling speed. These hypotheses on spiral growth hold for high-melting-point oxides as well as for the lower melting silicon.

Harvard Citation style: Schwabe, D. (2020) Spiral Crystal Growth in the Czochralski Process-Revisited, with New Interpretations, Crystal Research & Technology, 55(2), Article 1900073. https://doi.org/10.1002/crat.201900073

APA Citation style: Schwabe, D. (2020). Spiral Crystal Growth in the Czochralski Process-Revisited, with New Interpretations. Crystal Research & Technology. 55(2), Article 1900073. https://doi.org/10.1002/crat.201900073