Semiconductor Question

Discussion in 'Homework Help' started by hitmen, Feb 4, 2010.

  1. hitmen

    Thread Starter Active Member

    Sep 21, 2008
    159
    0
    1)In a lab experiment we did, it was discovered that voltage at the outer probes exceeds that of the inner probes by a 1000 times using the 4-pin probe test.

    I know that it isnt due to the distance.

    Can anybody explain?

    2) The mobility of n type semiconductor exceeds that of p type. I got the results but I am not sure why. Why?
     
  2. killerfish

    Member

    Feb 27, 2009
    17
    4
    Hi,

    i just did that lab today :D

    i remember my partner explained to me, it is something to due to the edges is not complete as inner so there is less current spread than inner...
     
  3. nsaspook

    AAC Fanatic!

    Aug 27, 2009
    2,910
    2,173
    A little extra reading for ya.. http://www.fourpointprobes.com/fpp.html
     
  4. hitmen

    Thread Starter Active Member

    Sep 21, 2008
    159
    0
    We are probably in the same lab then. Is there a formula for it?

    Also does anyone know about why the n-type has high mobility?
     
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