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What is diffusion and Ion Implantation ?

  1. May 24, 2014 #1
    Q1what is ion implantation in wafer fabrication ?
    Ion implantation is process by which ion of material accelerated in electric field and impacted into silicon wafer

    Q2what is diffusion in wafer fabrication ?
  2. jcsd
  3. May 24, 2014 #2

    Simon Bridge

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    You seem to have answered Q1, what about Q2?
  4. May 24, 2014 #3


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    Maybe a few videos on the subjects will help.

    Ion Implantation 101:

    Last edited by a moderator: Sep 25, 2014
  5. May 26, 2014 #4
    I need to write Definition

    look at this

    Ion Implantation is process by which ion of material are accelerated in electric field and placed into wafer

    diffusion is process by which impurity introduced into wafer surface

    doping - adding impurity into wafer surface

    I don't understand what is difference between doping, diffusion and ion Implantation?
  6. May 29, 2014 #5
    Doping is adding atoms to a material to modify the conduction properties, for example to make an N type conductor or a P type conductor.

    Diffusion is allowing atoms of one material to move by heating it enough that the atoms can move to other positions. One can dope silicon by putting arsenic (or other dopants) on the silicon surface, and putting the silicon wafer in an oven at a temperature that allows the arsenic atoms to diffuse (or move) into the silicon and modify the conduction properties. By choosing the proper temperature and diffusion time it can be possible to control the depth and concentration of the arsenic in a way that is useful for making a desired semiconductor device.

    Ion implantation is making a beam of energetic ions and allowing them to hit a surface made of some material -- a material different from the ions. It is used to modify the properties of the material being bombarded. It can also be used to dope semiconductors. The high energy of the ions can damage the lattice structure that is being doped, so it is usually necessary to anneal the semiconductor by heating to allow it to "heal itself". Ion implantation can also be used to harden metal surfaces or change their friction properties by choosing the right type of ions to implant.
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