Abstract
We studied alumothermic reduction of silica from silicate slag to obtain silicon-containing Alloy-I and Alloy-II. Phosphorous industry waste and synthetic slag are used as a silicate slag that consists of more than 90% silicon and calcium oxides and less than l0% other elemental oxides. Silicon-containing Alloy-I was upgraded by acid leaching to silicon of a fine powder structure. Using this powder, we grew poly- and mono-crystalline p-type silicon, with resistivity of ∼0.24 Ω cm, by the Czochralski method. Silicon-containing Alloy-II was used for obtaining monosilane by aqueous treatment with hydrochloric acid under atmospheric conditions and without any catalyst. There was no trace of diborane, which is a common source for boron contamination in crude silane.
Original language | American English |
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Pages (from-to) | 1785-1791 |
Number of pages | 7 |
Journal | Solar Energy Materials and Solar Cells |
Volume | 93 |
Issue number | 10 |
DOIs | |
State | Published - Oct 2009 |
NREL Publication Number
- NREL/JA-520-46647
Keywords
- Acid leaching
- Alumothermic reduction
- Metallurgical-grade silicon
- Solar-grade silicon
- Solidification
- Upgraded silicon