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Homework Help: Hole Diffusion Current of a P-N Junction

  1. Mar 1, 2012 #1
    1. The problem statement, all variables and given/known data

    A p+-n junction with the n-side donor concentration of 1016cm-3. If ni = 1010cm-3, the relative dielectric constant er = 12, Dn = 50cm2/s, Dp = 20cm2/s, tn = 100ns, tp = 50ns. Calculate the hole diffusion current density 2mm from the depletion edge on the n-side under a forward bias of 0.6V.

    2. Relevant equations

    J(p) [drift] = -qDpΔp

    3. The attempt at a solution

    My only understanding of how to solve this problem is by the relevant equation given above, yet i dont know how to find Δp from the given information. Perhaps there is another equation that suites better in solving this problem given the parameters at hand.
  2. jcsd
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