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Linearly graded pn junctions

  1. Dec 1, 2012 #1
    Hi, my question is:

    Given a linearly graded on-junction with the following doping conditions a=10^21

    I have to calculate Emax, Vbi, W and the junction capacitance with Va=0.2V and Vr=-5V

    This is for Silicon @ T=300k

    ----

    From what I understand, I have to use an iterative method but I don't think I'm getting the correct answer.

    I'm using this equation Vbi=Vt*ln((a*Xo)/(ni))^2


    Vt=0.0259
    ni=1.5x10^10
    a=10^21

    where Xo= depletion region width

    ----

    Since i'm not given Vbi or Xo, I tried using an iterative method and Vbi and Xo converge at 20.202

    I'm not quite sure what to do with this number or which value it pertains to. I would make the assumption that the potential barrier would be around 0.65-0.7V

    Can anyone lead me to the right direction? Thanks.
     
  2. jcsd
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