Polysilicon Production in Mitsubishi Materials Corporation

Ito, Hideo; Hanaue, Y.

doi:10.2473/journalofmmij.123.704

Cited by 5 publications

(3 citation statements)

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“…The yield of SiHCl 3 in the product silane gas is almost 90 %, and the major remaining species is SiCl 4 . [22,78] The SiHCl 3 product is then purified by using distillation to utilize the difference between its boiling point and those of the impurities. A distillation tower with several tens of trays is used for producing high-purity SiHCl 3 .…”

Section: H 2 Reduction And/or Thermal Decomposition Of Sihcl 3 (Siemementioning

confidence: 99%

“…The produced Si has ntype characteristics, and its specific resistance is above 1000 W cm À1 . [22] The decomposition of SiHCl 3 to form Si proceeds above 673 K, [80] and the Si deposition temperature can be lowered or the Si deposition speed can be accelerated by introducing H 2 gas into the system. In the temperature range of the Siemens process, H 2 reduction and thermal decomposition proceed simultaneously.…”

Section: H 2 Reduction And/or Thermal Decomposition Of Sihcl 3 (Siemementioning

confidence: 99%

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Processes for Production of Solar‐Grade Silicon Using Hydrogen Reduction and/or Thermal Decomposition

2014

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High‐purity Si used for photovoltaic applications, namely, solar‐grade Si (SOG‐Si), is commercially manufactured using the Siemens process. Although the present levels of supply satisfy the demand, there can potentially be a shortage of SOG‐Si in the long term. To overcome the low productivity of the Siemens process, various types of SOG‐Si production/purification processes have been developed as post‐Siemens processes. Some processes are under development as new commercial processes. These processes can be classified into the following three categories: (1) hydrogen reduction and/or thermal decomposition of silane‐based gases in improved Siemens‐based processes, (2) metallothermic reduction of silicon halides by Zn or Al, and (3) upgrading metallurgical‐grade Si by employing metallurgical purification methods. This paper presents a review of various types of SOG‐Si production processes, particularly those based on the hydrogen reduction and/or thermal decomposition of halides and silane‐based gases. These processes are classified on the basis of Si compounds used and the reaction types; further, the features of these processes are also analyzed. Future prospects for the development of new high‐purity Si production process are also presented.

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Section: H 2 Reduction And/or Thermal Decomposition Of Sihcl 3 (Siemementioning

confidence: 99%

Section: H 2 Reduction And/or Thermal Decomposition Of Sihcl 3 (Siemementioning

confidence: 99%

Processes for Production of Solar‐Grade Silicon Using Hydrogen Reduction and/or Thermal Decomposition

2014

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“…The details of each production process are examined based on original literature and published review articles. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Most methods used for producing high-purity silicon utilize silicon compounds as intermediate feed materials that can be purifi ed to a high degree by conventional technologies. First the low-purity MG-Si is converted into silicon compounds.…”

Section: Kouji Yasuda and Toru H Okabementioning

confidence: 99%

Solar-grade silicon production by metallothermic reduction

Yasuda

Okabe

2010

JOM

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JOM • December 2010 94 www.tms.org/jom.html Overview characterization of next-generation materials How would you… …describe the overall signifi cance of this paper?Various types of production processes of solar-grade silicon are under development to replace the conventional Siemens process. This paper reviews the production processes of solar-grade silicon based on metallothermic reduction proposed or investigated in the past.…describe this work to a materials science and engineering professional with no experience in your technical specialty?With the aim of mass-producing inexpensive high-purity silicon used for solar cells, namely solar-grade silicon, many types of processes are currently under development. The production processes of solar-grade silicon based on metallothermic reduction are reviewed in this work. …describe this work to a layperson?Silicon-based solar cells play an important role in sustainable energy. Currently, new production processes of high-purity silicon for solar cells are widely being developed. This paper reviews the processes utilizing the reduction of silicon compounds which are proposed or investigated.

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Electrochemical production of silicon

Yasuda

2022

High Temperature Materials and Processes

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Silicon solar cells are crucial devices for generating renewable energy to promote the energy and environmental fields. Presently, high-purity silicon, which is employed in solar cells, is manufactured commercially via the Siemens process. This process is based on hydrogen reduction and/or the thermal decomposition of trichlorosilane gas. The electrochemical process of producing silicon has attracted enormous attention as an alternative to the existing Siemens process. Thus, this article reviews different scientific investigations of the electrochemical production of silicon by classifying them based on the employed principles (electrorefining, electrowinning, and solid-state reduction) and electrolytes (molten oxides, fluorides, chlorides, fluorides–chlorides, ionic liquids [ILs], and organic solvents). The features of the electrolytic production of silicon in each electrolyte, as well as the prospects, are discussed.

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Polysilicon Production in Mitsubishi Materials Corporation

Cited by 5 publications

References 1 publication

Processes for Production of Solar‐Grade Silicon Using Hydrogen Reduction and/or Thermal Decomposition

Processes for Production of Solar‐Grade Silicon Using Hydrogen Reduction and/or Thermal Decomposition

Solar-grade silicon production by metallothermic reduction

Electrochemical production of silicon

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