Production Of Solar Grade Silicon

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| By Sheetal Fernandes
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Sheetal Fernandes
Community Contributor
Quizzes Created: 1 | Total Attempts: 39
Questions: 12 | Attempts: 39

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Production Of Solar Grade Silicon - Quiz


Questions and Answers
  • 1. 

    Name

  • 2. 

    USN

  • 3. 

    This is not the Property of Si 

    • A.

      Silicon has 4 valence electrons to form four covalent bonds with its four neighbors.

    • B.

      Sillicon is a semiconductor with a band gap of 1.12eV at 250C.

    • C.

      Silicon can neither contract on melting nor expand on heating

    • D.

      Silicon is brittle when alloyed with small quantities of impurities

    • E.

      Si can be easily doped with n type and p type impurities

    Correct Answer
    C. Silicon can neither contract on melting nor expand on heating
    Explanation
    Silicon can neither contract on melting nor expand on heating because it has a unique property called a negative coefficient of thermal expansion. This means that as silicon is heated, its volume actually decreases rather than expanding like most other substances. This property is advantageous in various applications, such as in the manufacturing of electronic devices, where precise control of dimensions is crucial.

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  • 4. 

    Purity level requirement for solar grade silicon is 

    • A.

      Much higher than metallurgical grade Silicon

    • B.

      Much Lower than metallurgical grade Silicon

    • C.

      Lower than semiconductor grade silicon.

    • D.

      Much higher than semiconductor grade silicon.

    Correct Answer(s)
    A. Much higher than metallurgical grade Silicon
    C. Lower than semiconductor grade silicon.
    Explanation
    The purity level requirement for solar grade silicon is much higher than metallurgical grade silicon because solar grade silicon is used for the production of solar cells, which require a higher level of purity to ensure efficient energy conversion. On the other hand, the purity level requirement for solar grade silicon is lower than semiconductor grade silicon because semiconductor grade silicon is used in the production of electronic components, such as microchips, which require an even higher level of purity for optimal performance.

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  • 5. 

    Production of metallurgical grade silicon involves

    • A.

      Refining  of Silica by adding sand and lime stone

    • B.

      Heating sand at 1500-2000 degree Celsius

    • C.

      Reduction of  Quartz  in presence of Coke in an electric furnace

    • D.

      Purification by fractional distillation

    Correct Answer
    C. Reduction of  Quartz  in presence of Coke in an electric furnace
    Explanation
    The correct answer is the reduction of Quartz in the presence of Coke in an electric furnace. This process is used in the production of metallurgical grade silicon. Quartz is a mineral that contains silicon dioxide (SiO2), and it is reduced to produce silicon. Coke, which is a form of carbon, is used as a reducing agent to remove oxygen from the quartz. The reduction reaction takes place in an electric furnace, where high temperatures are applied to facilitate the reaction. This process is an important step in the production of silicon, which is used in various industries, including the production of solar cells and electronic devices.

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  • 6. 

    Production of Solar Grade Silicon by Chemical Vapour Deposition Method involves

    • A.

      Preparation of volatile silane (SiH4) from metallurgical grade silicon 

    • B.

      Purification by fractional distillation

    • C.

      Reduction of  Quartz  in presence of Coke in an electric furnace

    • D.

      Decomposition of pure silane (SiH4) to yield Ultra pure silicon.

    Correct Answer(s)
    A. Preparation of volatile silane (SiH4) from metallurgical grade silicon 
    B. Purification by fractional distillation
    D. Decomposition of pure silane (SiH4) to yield Ultra pure silicon.
    Explanation
    The correct answer is the combination of the three steps: preparation of volatile silane (SiH4) from metallurgical grade silicon, purification by fractional distillation, and decomposition of pure silane (SiH4) to yield ultra-pure silicon. These steps are involved in the production of solar-grade silicon using the chemical vapor deposition method. The process starts with the preparation of volatile silane from metallurgical grade silicon, which is then purified through fractional distillation. Finally, the pure silane is decomposed to obtain ultra-pure silicon, which is suitable for use in solar panels.

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  • 7. 

    Rod of high purity silicon  is obtained by 

    • A.

      Purification by fractional distillation

    • B.

      Reduction of  Quartz  in presence of Coke in an electric furnace

    • C.

      Decomposition of pure silane (SiH4) to yield Ultra pure silicon.

    • D.

      Zone Refining

    Correct Answer
    D. Zone Refining
    Explanation
    Zone refining is a process used to obtain a rod of high purity silicon. In this process, impurities are removed from a solid material by passing it through a heated zone. As the material passes through the zone, impurities are selectively melted and move along the length of the material, while the purified material solidifies. This process is repeated multiple times to further purify the material. Zone refining is an effective method for obtaining high purity silicon because it allows for the removal of impurities in a controlled and precise manner.

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  • 8. 

    Zone Refining Involves 

    • A.

      Rod of silicon is clamped vertically and heated by a heating coil in a reducing atmosphere. 

    • B.

      The heating coil is moves from top to bottom which will melt the silicon

    • C.

      Impurities get swept to the end of the rod with the molten material

    • D.

      All these 

    Correct Answer
    D. All these 
  • 9. 

    Principle Involved in Zone Refining 

    • A.

      Impurities are removed  by a vertically moving  heating coil

    • B.

      Impurities being more soluble get swept to the end of the rod with the molten material .

    • C.

      Option 4

    Correct Answer
    B. Impurities being more soluble get swept to the end of the rod with the molten material .
    Explanation
    In zone refining, impurities are removed by a process of repeated melting and solidification of a rod of material. As the rod is heated and melted, impurities that are more soluble in the molten material will tend to move towards the end of the rod with the molten material. This occurs because the impurities have a higher affinity for the molten material and are more likely to dissolve in it. As the molten material solidifies, the impurities become trapped at the end of the rod, resulting in a purified section of material. Therefore, option 4 correctly explains the principle involved in zone refining.

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  • 10. 

    When Silane is  heated on Silicon rods, silane decomposes to 

    • A.

      H2SiCl2.

    • B.

      4 H SiCl3

    • C.

      Si + 2H2

    • D.

      SiCl4

    Correct Answer
    C. Si + 2H2
    Explanation
    When silane (SiH4) is heated on silicon rods, it decomposes into silicon (Si) and two molecules of hydrogen gas (H2).

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  • 11. 

    Product formed on Hydrogenation of tetrachloro silane (SiCl4) is 

    • A.

      H2SiCl2.

    • B.

      4 H SiCl3

    • C.

      Si + 2H2

    • D.

      SiCl4

    Correct Answer
    B. 4 H SiCl3
    Explanation
    When tetrachloro silane (SiCl4) undergoes hydrogenation, it reacts with hydrogen (H2) to form 4 molecules of hydrogenated tetrachloro silane (H SiCl3). The reaction involves the replacement of four chlorine atoms with four hydrogen atoms, resulting in the formation of 4 H SiCl3.

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  • 12. 

    When trichloro silane (HSiCl3) is passed through a fixed bed column filled with quaternary ammonium ion – exchange resin acting as Catalyst. HSiCl3 is converted to

    • A.

      H2SiCl2.

    • B.

      4 H SiCl3

    • C.

      Si + 2H2

    • D.

      SiCl4

    Correct Answer
    A. H2SiCl2.
    Explanation
    When trichloro silane (HSiCl3) is passed through a fixed bed column filled with quaternary ammonium ion – exchange resin acting as a catalyst, it undergoes a reaction that converts it into H2SiCl2.

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