Process for producing boron added purified silicon
US8187564B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2009 |
| Grant date | May 29, 2012 |
| Priority date | — |
| Expiry date | Apr 30, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S136/291
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided is a process for producing a boron added silicon (purified silicon) in an energy saving mode from a reduced silicon obtained by reducing a silicon halide with a metal aluminium. The production process of the invention comprises reducing a silicon halide with a metal aluminium to give a reduces silicon, heating and melting the resulting reduced silicon, and adding boron thereto followed by solidification for purification under the condition of a temperature gradient provided in one direction in a mold. Preferably, after washed with an acid, the reduced silicon is heated and molten, and boron is added thereto. After the reduced silicon is heated and molten under reduced pressure, boron is added thereto. After heated and molten, the reduced silicon is purified by solidification in one direction, then heated and molten, and thereafter boron is added thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.