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Semiconductor - Hall Effect

  1. Apr 14, 2010 #1
    A question on semiconductors.

    I need to determine the carrier concentration and type.

    I have worked out the type but its the conc. that is getting me.

    I have the conc., n, as:

    n = wBJ / eV

    w is the width of sample, B the mag. field, e is charge, and V the Hall voltage...these are all known EXCEPT J. Now the only other pieces of info I have are the sample dimensions and the battery voltage that supplies the current.

    I cant for the life of me see where I find J. I just cant get it!

    Any pointers in the right directions?
     
  2. jcsd
  3. Apr 14, 2010 #2
    one way to start is by noting that J = I/(wt) , where t is the thickness of the sample ..
     
  4. Apr 14, 2010 #3
    Yes, but i do not know the current? It leaves me in the same boat...
     
  5. Apr 14, 2010 #4
    okay .. what if you considered the relation v = IR >> I = v/R .. you can get it dont give up :)
     
  6. Apr 14, 2010 #5
    Dont have R tho... :p

    i only have the info as stated in the question. Damn im confused!
     
  7. Apr 14, 2010 #6
    COME ON!! :eek: .. just break things up >> I cant help you with this one, I will just give hints .. you said you want R , so can you find another relation from where you can get R from what you are given in the question (of course other than R=V/I) >>> there is one please try to make some efforts I know sometimes it is not easy but atleast try harder ..
     
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