Directional solidification system and method

摘要

The present invention relates to an apparatus and method for purifying materials using a rapid directional solidification. Devices and methods shown provide control over a temperature gradient and cooling rate during directional solidification, which results in a material of higher purity. The apparatus and methods of the present invention can be used to make silicon material for use in solar applications such as solar cells.

主权项

1. A system for directional solidification, comprising:
a mold, including:
an outer jacket;a base positioned to directly contact molten material, the base lining a bottom of the outer jacket, the base including a heat conducting material of a higher thermal conductivity than a wall material positioned to directly contact molten material; anda wall insulation structure positioned to directly contact molten material, the wall insulation structure lining a wall of the outer jacket, the wall insulation structure tapering in thickness from a rim of the mold, having a first thickness, to a bottom portion of the mold, having a second thickness that is thinner than the first thickness.