Production of Solar Grade (SoG) Silicon by Refining Liquid Metallurgical Grade (MG) Silicon: Final Report, 19 April 2001

Khattak, C. P.; Joyce, David B.; Schmid, F.

doi:10.2172/786367

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…Table shows the initial B and Zr contents of molten Si–Cu alloy and residual B, Zr, and Cu contents of refined Si. The initial B-content was set at 80 ppmw (153 ppma), since the B-content in MG-Si is normally 13–130 ppma, with the consideration of possible contamination from Cu or the Zr additive.…”

Section: Resultsmentioning

confidence: 99%

Low-Temperature Process for the Fabrication of Low-Boron Content Bulk Si from Si–Cu Solution with Zr Addition

Ren

Morita

2020

ACS Sustainable Chem. Eng.

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A novel approach was put forward to remove B from Si by utilizing Zr as an additive during solidification, whereby, using the Si–Cu solvent, bulk Si with large area and low boron content was obtained. The premise of this work is based on the following parameters: (i) the lower liquidus temperature of the Si–Cu system; (ii) the notable density difference between solid Si and liquid Si–Cu; (iii) the low solubility of Cu in solid Si; and (iv) the strong affinity of Zr for B, enhancing boride formation. The experimental results show that (i) intermediate ZrB2 compounds were found at the bottom of the sample; (ii) the B-removal fraction improved significantly, the highest of which was 93.4%; (iii) large areas of bulk Si were obtained, and a high Si enrichment percentage of 99.2% was achieved; (iv) the residual Cu content was reduced to a relatively low level, the molar fraction of which ranged from 0.00099 to 0.00191; and (v) the Zr additive was completely removed and did not pollute the refined Si. This one-step directional solidification process provides a better alternative for Si-based solvent refining to produce solar-grade silicon for use in the photovoltaic industry.

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Section: Resultsmentioning

confidence: 99%

Low-Temperature Process for the Fabrication of Low-Boron Content Bulk Si from Si–Cu Solution with Zr Addition

Ren

Morita

2020

ACS Sustainable Chem. Eng.

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“…At lower solidification rates, Khattak et al [16] published some impurities analysis obtained after a purification process including two refining steps and one step of directional solidification of 1 kg charge of MG-Si. They achieved a decrease of the phosphorus concentration from 27-30 to 12 ppma.…”

Section: Resultsmentioning

confidence: 99%