silicon wafer

Discussion in 'General Electronics Chat' started by vead, May 9, 2014.

  1. vead

    Thread Starter Active Member

    Nov 24, 2011
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    I want to understand how does silicon chip make from silicon sand,
    for my basic understanding I have done something

    step1- silicon raw material
    step2- silicon melted
    step3- silicon cooled
    step4- silicon wafer
    step5- silicon wafer clean by acid
    step6- polished
    step7- wafer cut into slice

    I don't know that's correct step and I know that's not enough for wafer preparation
     
  2. Papabravo

    Expert

    Feb 24, 2006
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  3. vead

    Thread Starter Active Member

    Nov 24, 2011
    621
    8
    step1- silicon raw material
    step2- silicon melted
    step3- silicon cooled
    step4- silicon wafer
    step5- silicon wafer clean by acid
    step6- polished
    step7- wafer cut into slice
    step8- n mos layer
    step9 - pmos layer
    step10-metalic layer

    you mean this type
     
  4. Papabravo

    Expert

    Feb 24, 2006
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    You forgot insulation layers(silicon dioxide). That is how they make the gate of a MOSFET.
     
  5. vead

    Thread Starter Active Member

    Nov 24, 2011
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    so all step is correct
     
  6. Papabravo

    Expert

    Feb 24, 2006
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    Except for the number of times each step needs to be executed to make a functional chip. There may be other steps in some processes that I am not familiar with. Gimme a break, it has been over 40 years since I learned this stuff and I'm now retired. Did you read the article that I gave you the link for?
     
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  7. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Raw silicon material is silicon, not silica sand (silicon dioxide).

    The silicon is purified over and over with a zone refining system.

    Then sliced into wafers

    Then polished and cleaned
    *
    Then photomasked

    Expose photoresist

    Eliminate positive or negative resist space (depending on technology)

    Then fed into a vapor deposition (chemical or physical) - or ion beam.

    Then strip remaining photo resist

    Then return to * above (many times)

    Then cut array of chips on your wafer of silicon

    Then add leads

    Then test

    Then package (overmold) with connectors

    - I think I got most everything
     
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  8. vead

    Thread Starter Active Member

    Nov 24, 2011
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    you did not mention step where component fabricate on chip
    that's very hard part to understand
    we cut wafer into slice i think we will be fabricate component on this die then test and then package
     
  9. absf

    Senior Member

    Dec 29, 2010
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    Steps 8-10 should be before step #7. Making chips is like making PCBs. We would copy and paste as many copies as possible of one circuit pattern to fill up the whole blank PCB.

    After etching and cleaning and drilling on the PCB, we start cutting indivisual PCBs from the large PCB.

    Allen
     
  10. MrChips

    Moderator

    Oct 2, 2009
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    You forgot the part where the silicon crystal is grown into an ingot.
     
  11. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    absf and MrChips like this.
  12. MrChips

    Moderator

    Oct 2, 2009
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    absf and vead like this.
  13. vead

    Thread Starter Active Member

    Nov 24, 2011
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    look at this

    step 1- silicon ( raw material)
    step 2- silicon is purified
    step 3- silicon is melted
    step 4- crystal is grown into ingot
    step 5- then sliced into wafer
    step 6 then polished and cleaned

    I think we are ready to fabricate component on chip

    I want to fabricate transistor

    n mos layer
    p mos layer
    metal layer
    sio2 layer

    Q1- first which layer will be used on chip
     
  14. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Hypothetically or actually?:D
     
  15. vead

    Thread Starter Active Member

    Nov 24, 2011
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    just Hypothetically,


    transistor

    n mos layer
    p mos layer
    metal layer
    sio2 layer

    Q1- first which layer will be used on chip
     
  16. vead

    Thread Starter Active Member

    Nov 24, 2011
    621
    8
    I have doubt you said , raw material is silicon , I think raw material is silica sand

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

    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
     
    Last edited: Jul 8, 2014
  17. vead

    Thread Starter Active Member

    Nov 24, 2011
    621
    8
    does any one know the equipment that is used in vlsi technology

    chamber , quartz tube ,furnace

    which equipment used for oxidation , ion implantation and diffusion
     
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