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Homework Help: Elementary electronics and semiconductors

  1. Dec 6, 2014 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations
    intrinsic carrier density = ni = 10^10/cm^3 (for Si at 300K)

    3. The attempt at a solution
    Its a really elementary problem but I can't figure out the difference between some quantities. For example, free electrons and holes would be in same quantity since the bar isn't dopped? Valence electrons and free electrons are the same thing ? And I can't see a way to calculate the numbers of atoms.
  2. jcsd
  3. Dec 7, 2014 #2


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    2017 Award

    Staff: Mentor

    Right. And you have an equation that allows to find the product of those two numbers.


    How many valence electrons per silicon atom do you have?
    The number of atoms is independent of the semiconductor properties, but you'll have to look up material constants for silicon.
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