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Departure from convention?

  1. Oct 30, 2012 #1
    1. The problem statement, all variables and given/known data
    I am reading a chapter on semi-conductors in a text.It talks about n-p type semi-conductors and states that "the potential of the n-side is higher than that of the p-side"

    However, by convention, in case of batteries for example,we designate the negative terminal as lower potential and the positive terminal as higher potential.

    So, what can be the reason behind the author's terminology?

    Thanks.
     
  2. jcsd
  3. Oct 30, 2012 #2

    CWatters

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    P-type material has an excess of holes. N-type material has an excess of electrons. This is the reason they are called P and N type.

    It just happens that when a junction is formed the holes and electrons diffuse across the junction making the P-type side negative and the N-type side positive.
     
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