Solvent refining of silicon using nickel as impurity getter

Yin, Zhoulan; Oliazadeh, A; Esfahani, Shaghayegh; Johnston, M.D.; Barati, Mansoor

doi:10.1179/000844311x12949307643551

Cited by 48 publications

(12 citation statements)

References 14 publications

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“…For example, Yin et al [472] evaluated the addition of nickel as an impurity getter in solvent refining of silicon. Moreover, additional purification is also possible by sparging of the melt with reactive gases such as HCl, water vapor, or ammonia to convert boron to volatile or insoluble boron compounds or boron compounds that could be separated from the melt by precipitation or separation to an immiscible slag (fused salts or oxides) in contact with the melt.…”

Section: Purification Of Silicon For Solar Cells In An Lpe Processmentioning

confidence: 99%

Liquid-Phase Epitaxy

Mauk

2015

Handbook of Crystal Growth

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Section: Purification Of Silicon For Solar Cells In An Lpe Processmentioning

confidence: 99%

Liquid-Phase Epitaxy

Mauk

2015

Handbook of Crystal Growth

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“…Alloying with metal (Al, [4][5][6][7][8][9][10][11][12][13] Ca, [14][15][16] Cu, 17 18 Fe, [19][20][21][22][23] Ni, 24 etc.) is already being used in the metallurgical method.…”

Section: Introductionmentioning

confidence: 99%

Refining Behavior of Aluminum Alloyed Metallurgical-Grade Silicon During Fractional Melting Process

Lee¹,

Chung²,

Lee³

et al. 2013

j. nanosci. nanotech.

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In order to overcome the limitations in refining metallurgical-grade silicon (MG-Si) by fractional melting (FM), an alloying process was adopted. Aluminum was selected as the alloying element as it has no intermetallic compound and the lowest eutectic point (577 degrees C). A 2% Al-Si sample was made and purified by FM. The removal of 99.8% of impurities was obtained by FM via aluminum alloying with MG-Si. The 2% Al-Si sample was also effective in boron removal (99% refining ratio).

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“…Solvent refining is more convenient and economical than other processes for producing solar‐grade silicon (SOG‐Si). By alloying metals such as copper, nickel, iron, tin, and aluminum with silicon or by using impurity getters such as titanium or calcium , solvent refining has proved successful in removing a wide range of impurities, with aluminum being the most suitable alloying agent among those studied .…”

Section: Introductionmentioning

confidence: 99%

Centrifugal separation of primary silicon crystal in solvent refining of silicon using Al‐30% Si alloy

Kim¹,

Jeon²,

Shin³

2014

Crystal Research and Technology

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This study describes the formation of a primary silicon network during separation of an Al‐30% Si melt and the process conditions to make bigger primary silicon crystals. As the crucible rotates in the centrifugal separation, the unfrozen aluminum‐rich phase and small silicon particles are pushed outside through the openings in the silicon network. As a result, primary silicon crystals are separated in the form of a foam after centrifugation. The recovery of the silicon ranged from 13 to 18% depending on the location in the crucible. The size of the primary silicon achieved by changing the cooling rate and quenching temperature during solidification is also measured using a quenching furnace. Primary silicon particles exhibit a coarse, plate‐like morphology, although small star‐like silicon particles are also found in the aluminum‐rich matrix. The fraction of plate silicon decreases, while the fraction of small globular silicon increases with an increasing cooling rate. The thickness of the primary silicon plate also decreases with an increasing cooling rate in the samples quenched at various temperatures during solidification.

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Solvent refining of silicon using nickel as impurity getter

Cited by 48 publications

References 14 publications

Liquid-Phase Epitaxy

Liquid-Phase Epitaxy

Refining Behavior of Aluminum Alloyed Metallurgical-Grade Silicon During Fractional Melting Process

Centrifugal separation of primary silicon crystal in solvent refining of silicon using Al‐30% Si alloy

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