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Homework Help: Diffusion and Drift Current

  1. Dec 7, 2008 #1
    1. The problem statement, all variables and given/known data
    http://img223.imagevenue.com/img.php?image=79777_Untitled_122_69lo.jpg
    So for this setup i understand that the light generates EHP in the semiconductor and creates a concentration gradient which causes the electrons and holes to diffuse to the other side, so if the light is then shining perpendicular to the electric field, i.e. the light is shining on top, will the diffusion contribute to the total current?

    I'm guessing that it won't because the concentration gradient causes the electrons to diffuse from the top to the bottom.
     
  2. jcsd
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