Centre National De La Recherche Scientifique

Invensil

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Institut Polytechnique De Grenoble

Centre National De La Recherche Scientifique-cnrs

Efd Induction Sa

Ferropem

Ferropem S.a.s.

Christian Trassy

Pascal Rivat

Gerard Baluais

Yves Caratini

Yves Delannoy

Emmanuel Flahaut

Cyrille Ndzogha

Gérard Baluais

Etienne Grossier

François Cocco

The invention concerns a silicon designed in particular for making solar cells containing a total of impurities ranging between 100 and 400 ppm, a boron content ranging between 0.5 and 3 ppm, a phosphorus/boron content ratio ranging between 1 and 3, and a content of metal elements ranging between 30 and 300 ppm. The invention also concerns a method for making such a silicon from an oxygen- or chorine-refined metallurgical silicon containing at least 500 ppm of metal elements, and comprising: refusion under neutral atmosphere of the refined silicon, in an electric furnace equipped with a hot crucible; transferring the molten silicon, to provide a plasma refining, in an electric furnace equipped with a hot crucible; plasma refining with as plasma-forming gas a mixture of argon and of at least a gas belonging the group consisting of chlorine, fluorine, HCI and HF; casting under controlled atmosphere in an ingot mold wherein is produced segregated solidification.

High purity metallurgical silicon and method for preparing same

The invention concerns an inductive plasma torch comprising an external tube, an intermediate tube and a central injector (,) including at least a central tube (,) injecting reagent and a peripheral sheathing tube (,). A gas similar to plasma gas is injected into the space between the central tube (,) and the sheathing tube (,), in conditions suited for obtaining a laminar flow, said flow remaining laminar up to the plasma torch central zone. The sheathing tube emerges substantially at the first turn of the inductor coil.

Inductive plasma torch with a reagent injector

Growing community of inventors

Grenoble, France

Christian Trassy