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Homework Help: Semiconductor Devices

  1. Nov 29, 2008 #1
    1. The problem statement, all variables and given/known data

    For a forward biased P plus N abrupt junction diode, Lp = 1 micrometer, and at x = xn (x' = 0), the ratio of the hole current to the electron current, Ip/In, is 100 in the steady state. Determine Ip/In at x' = 1 micrometer.

    2. Relevant equations

    Jn = In/A

    Jp = Ip/A

    Jp(x') = qDpp0n/Lp[exp(qVa/KT) - 1]exp(-x'/Lp)

    Jn(-xp) = qDnnop/Ln[exp(qVa/KT) - 1]

    3. The attempt at a solution

    The attempt to the solution was to use the relationship of the second equation which is the hole current density equation. I have manipulated the equation to solve for the hole current which is Ip = AJp. This is where I got stuck and I could not finish the problem.
  2. jcsd
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