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Homework Help: Calculate the Diffusion lengty

  1. Aug 13, 2013 #1
    I'm wondering how this actually can be solved since i think there is one piece missing.

    1. The problem statement, all variables and given/known data
    Determin the diffusion length L on a P+N diode with Nd = 10^16 cm^-3 in the N region.

    2. Relevant equations
    Known is that Diffusion length can be found from L=sqrt(Dt)

    3. The attempt at a solution
    As D = kT/q*u where u can be determined using a electron and hole mobility graph.
    But now how can i find t?
    It is not staded what t is.
  2. jcsd
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