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
    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
    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
    Why does the material have to by crystalline?
  4. ranch vermin


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