Why semiconductor in Hall effect sensor?

Discussion in 'General Electronics Chat' started by jaydnul, May 22, 2015.

  1. jaydnul

    Thread Starter Member

    Apr 2, 2015
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    Why is a P-type semiconductor used instead of just a slab of resistive material? The moving charge would be moved by the magnetic field in the same way, causing a potential difference at the sides.
     
  2. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
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    1) A slab of P type semiconductor is a slab of resistive material
    2) Most materials will show some hall effect but you want significant one.
    3) The material has to be in the form of a crystalline solid, as near as possible to a single crystal. Normal resistors do not come in this form. They are a film on the surface of a former, or a spiral of metal.

    So it is easier and more reliable to prepare a slab of semiconductor to the required resistance to obtain suitable outputs.
     
  3. jaydnul

    Thread Starter Member

    Apr 2, 2015
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    Why does the material have to by crystalline?
     
  4. ranch vermin

    Member

    May 20, 2015
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    yeh, i want to know too - doesnt metal get as small?
     
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