Abstract
Pyro-metallurgical refining techniques are being developed for use with molten metallurgical grade (MG) silicon so that directionally solidified refined MG silicon can be used as solar grade (SoG) silicon feedstock for photovoltaic applications. The most problematic impurity elements ar B and P because of their high se4gregation coefficients. Refining processes such as evacuation, formation ofimpurity complexes, oxidation of impurities and slagging have been effective in removal of impurities from MG silicon. Charge sizes have been scaled up to 60 kg. Impurity analysis of 25 kg charge after refining and directional solidification has shown reduction of most impurities to <1 ppmw and B and P to <10 ppmw.
| Original language | American English |
|---|---|
| Pages | 2-11 |
| Number of pages | 10 |
| State | Published - 1999 |
| Event | Ninth Workshop on Crystalline Silicon Solar Cell Materials and Processes - Breckenridge, Colorado Duration: 9 Aug 1999 → 11 Aug 1999 |
Conference
| Conference | Ninth Workshop on Crystalline Silicon Solar Cell Materials and Processes |
|---|---|
| City | Breckenridge, Colorado |
| Period | 9/08/99 → 11/08/99 |
Bibliographical note
Work performed by Crystal Systems, Inc., Salem, MassachusettsNREL Publication Number
- NREL/CP-27179
