High purity granular silicon
AssigneeMEMC Electronic Materials, Inc.
InventorsJameel Ibrahim, Melinda Gayle Ivey, Timothy Dinh Truong
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Abstract
A high-purity semiconductor grade granular silicon composition, which can be produced in commercial quantities, is disclosed. In one embodiment the composition comprises a plurality of free-flowing particles having a total weight of at least about 300 kg and an average transition metal concentration of less than 0.2 ppba. In another embodiment the composition comprises a plurality of free-flowing silicon particles having a total weight of at least about 300 kg and at least 99 percent of the particles are between about 250 and 3500 microns in size.
Claims25
A granular silicon composition comprising a plurality of free-flowing silicon particles having a total weight of at least about 300 kg, wherein the particles have an average transition metal concentration of less than 0.2 ppba.
A granular silicon composition comprising a plurality of free-flowing silicon particles having a total weight of at least about 300 kg, wherein at least 99 percent of the particles are between about 250 and about 3500 microns in size.
The granular silicon composition of claim 17 wherein the total weight of the particles is at least one metric ton.
Dependencies are inferred from the claim text.