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Homework Help: Compound semiconductors in group IV

  1. Mar 16, 2010 #1
    1. The problem statement, all variables and given/known data

    Here is an excerpt from a work

    2. Relevant equations

    3. The attempt at a solution

    What I don't understand is the excerpt.

    Okay, silicon is #14, which has 3s2 3p2, total of 4 valence electrons.
    But I do not know

    (1) first, which and where is this surplus electron referring to / from? from the substitution (group V), or four covalent-bonded silicon?

    (2) second, so what about the substitution with an element of group V?

    Any comment is appreciated.
  2. jcsd
  3. Mar 17, 2010 #2
    Re: semiconductor

    A substitution from group V will have five valence electrons instead of four.
  4. Mar 23, 2010 #3
    Re: semiconductor

    So it is from the substitution, since you can't fit the extra one.

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