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Electric field between bands in semiconductors

  1. Jul 2, 2010 #1
    i read in an online course about semiconductors that electric field between [tex]E_c[/tex] and [tex]E_v[/tex]
    given by:

    [tex]E=\frac{dE_c}{q dx}[/tex]

    and i know the general form of electric field is :
    and what is the direction of this feild ,i know from positive to negative , from [tex]E_c[/tex] to [tex]E_v[/tex]? because both [tex]E_c[/tex] & [tex]E_c[/tex] have electrons and holes

    and dose any one know what is [tex]\mu_n[/tex] electron mobilities

    thank you very much!
    Last edited: Jul 2, 2010
  2. jcsd
  3. Jul 2, 2010 #2


    User Avatar
    Science Advisor

    First off be careful with your notation. When using Electric Field and Energy you're best off not to use the symbol "E" for both. Consider using "E" for electric field and "W" for work or energy.

    Second and more important, you seem to have a fundamental misunderstanding of the semiconductor energy band model. The conduction and valence bands represent different energy levels in the semiconductor, they are not spatially separated.
  4. Jul 2, 2010 #3
    yes! i'm sorry you are right
    could i have an electric field between negative charge and positive charge even if there isn't a space between them .
    and is it correct that:
    the direction of this field is,i know from positive to negative , from CB(conduction band) to VB ?
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