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Fundamental Aspects of High Speed Crystal Growth from theMelt

Published online by Cambridge University Press:  25 February 2011

A.G. Cullis*
Affiliation:
Royal Signals and Radar Establishment, St. Andrews Road, Malvern, Worcs. WR14 3PS, England
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Abstract

Advances in the study of high speed crystal growth from the melt arereviewed, with special emphasis on the fast melting and solidification ofsilicon achieved by use of Q-switched laser radiation pulses. Rapid meltingof amorphous Si is confirmed to yield a liquid undercooled by severalhundred Kelvins and, under suitable conditions, explosive crystal growthprocesses can occur. The latter involve the self-sustaining propagation ofmelt bands buried within the initially amorphous material. When the highestquench-rate conditions are established melting of even crystalline Si canyield a final amorphous solid phase. This breakdown in crystal growth isorientation dependent and can give regimes of crystal defect formation whenamor-phization does not take place. The processes which characterize thislimiting growth behaviour are discussed.

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