MONITORING THE ADVANCEMENT OF LIBS-BASED FUSION DURING THE PRODUCTION OF A INGOT BY SOLIDIFICATION DIRECTED BY REPEAT ON GERMS

摘要

The invention relates to a method useful for monitoring the progress of the melting during the production of a silicon ingot by germ - directed solidification, comprising at least the steps of: (i) disposing, in a crucible a silicon charge positioned on the surface of one or more silicon seeds; said one or more seeds, and / or said silicon charge in one or more given position (s), comprising one or more tracer agents chosen from n-type or p-type doping agents having a partition coefficient in the silicon less than or equal to 10-1; metal elements having a partition coefficient in silicon less than or equal to 10-4; and the iso-electronic elements of silicon germanium and tin; (ii) evaluating, during the melting of the silicon charge, the presence and / or amount of tracer agent (s) by a chemical measurement technique of the LIBS type on the surface of the molten silicon bath; and (iii) determining, from the LIBS measurement (s), the progress of the merger.