Abstract

Embodiments of the present invention relate to a process for obtaining silicon crystals from silicon. The method includes contacting silicon powder with a solvent metal to provide a mixture containing silicon, melting the silicon under submersion to provide a first molten liquid, contacting the first molten liquid with a first gas to provide dross and a second molten liquid, separating the dross and the second molten liquid, cooling the second molten liquid to form first silicon crystals and a first mother liquid and separating the first silicon crystals and the first mother liquid.

IPC Classes  ?

• C30B 9/10 - Metal solvents
• C01B 33/021 - Preparation
• C01B 33/037 - Purification
• C30B 9/06 - Single-crystal growth from melt solutions using molten solvents by cooling of the solution using as solvent a component of the crystal composition

Abstract

A method for purifying silicon wherein silicon is crystallized from a solvent metal. The method comprises the steps of providing a molten liquid containing silicon, a solvent metal and impurities, cooling the molten liquid to form first silicon crystals and a first mother liquor, separating the first silicon crystals from the first mother liquor, contacting the first silicon crystals with compound which will dissolve the first mother liquor and separating the washed crystals from the wash solution.

IPC Classes  ?

• C30B 9/10 - Metal solvents
• C01B 33/037 - Purification
• C30B 29/06 - Silicon
• C30B 33/00 - After-treatment of single crystals or homogeneous polycrystalline material with defined structure

Abstract

Embodiments of the present invention relate to a process for purifying silicon by removing one or both of phosphorus and boron.

IPC Classes  ?

• C01B 33/037 - Purification
• C22C 21/02 - Alloys based on aluminium with silicon as the next major constituent
• C22C 29/18 - Alloys based on carbides, oxides, borides, nitrides or silicides, e.g. cermets, or other metal compounds, e. g. oxynitrides, sulfides based on silicides
• C22C 3/00 - Removing material from non-ferrous alloys to produce alloys of different constitution

Abstract

The present invention provides for methods of purifying silicon, methods for obtaining purified silicon, as well as methods for obtaining purified silicon crystals, purified granulized silicon and/or purified silicon ingots.

IPC Classes  ?

• C01B 33/037 - Purification
• C01B 33/02 - Silicon
• C30B 29/06 - Silicon