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How to make a crunchy silicon wafer

Discussion in 'Electronics Homework Help' started by vead, Jul 8, 2014.

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  1. vead

    vead

    473
    14
    Nov 27, 2011

    i have doubt that which type of material we used in VLSI technology
    silicon raw material is silicon sand or silicon gas

    sand -> silicon gas - reactor -> poly-silicon -> electronic grade silicon -> cz method -> wafer


    I think sand is raw material from earth It convert into silicon gas , then silicon is purified in zone refining system and produced poly silicon

    please tell me I just want to confirm that I am right or wrong
     
  2. Laplace

    Laplace

    1,252
    184
    Apr 4, 2010
    This seems more of a chemistry question than electronics. I believe most metallurgical grade silicon is produced by burning sand (silicon dioxide) with carbon to yield carbon dioxide gas and raw silicon. This is then refined to 99.9% purity for electronics grade polysilicon suitable for solar cells. Further refinement to 99.9999999% purity ingots is necessary for VLSI crystalline silicon wafers. Some of the chemical processes involved might use silicon gas such as silane for refinement and polysilicon film deposition. Regrettably I don't know enough about silicon chemistry to confirm whether you are right or wrong.
     
  3. Harald Kapp

    Harald Kapp Moderator Moderator

    10,548
    2,350
    Nov 17, 2011
    Your question is rather pointless.

    VLSI means Very Large Scale Integration and per se does not imply any technology for manufacturing the chips. Apart from silicon there are ather materials suitable to build semiconductor devices from like e.g. Germanium, Gallium Arsenide, Zinc Oxide etc. In principle you can integrate a VLSI chip structure onto many of them, although this may be technically difficult, lead to very large chips (if the transistor structures can't be scaled down as on silicon) or prohibitively expensive.

    Silicon is simply (one of) the best researched semiconductor materials with some properties that make it very suitable for use in highly integrated circuits (VLSI chips). And the infrastructure for commercially exploiting sislicon in the manufacture of chips is very well developed.
     
  4. vead

    vead

    473
    14
    Nov 27, 2011
    I am looking information about wafer making equipment I have read some thing

    wafer preparation

    material for wafer preparation
    raw material - silicon is raw material

    MGS metalluragical grade silicon
    EGS electron grade silicon


    wafer making equipment

    crucible
    pure silicon is placed in crucible that is made of quartz


    crucible supporter


    vacuum chamber
    crucible is then put in vacuum chamber which is sealed and then filled with some gas

    heater

    the chamber is heated up to 1500 c to melt silicon


    crucible shaft

    when silicon is melted nicely the seed is rotated as it slowly pulled out of molten silicon


    is it all equipment or I have forgotten some
     
  5. Harald Kapp

    Harald Kapp Moderator Moderator

    10,548
    2,350
    Nov 17, 2011
    This is completely unrelated to VLSI technology, it's about the making of silicon wafers...
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,418
    2,788
    Jan 21, 2010
    The number of silicon gas mines might suggest which one it's not.
     
    Arouse1973 likes this.
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