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Homework Help: Ln sigma vs 1/T curve for p-type semiconductor

  1. Mar 31, 2012 #1
    1. The problem statement, all variables and given/known data

    a) Sketch a schematic band structure diagram for a p-type semiconductor. Mark the energy of the top of the valence band, the bottom of the conduction band and the impurity level on the diagram.

    b) Sketch the ln (σ) versus 1/T curve for a p-type semiconductor, where σ is the conductivity and T is the temperature. Explain how the shape of the curve relates to the energy levels in the diagram in part a).

    3. The attempt at a solution

    b) The diagram I found in my notes has ln (σ) on the y-axis and 1/T on the x-axis, and there is a line with a negative gradient, and then it is flat where there is saturation and then the line has a negative gradient again. But I am not sure whether this is for an n-type or p-type semiconductor. I could only find one diagram in my notes and nowhere seems to tell me how the graph looks different for an n-type or p-type semiconductor.

    Do the graphs look different for n-type and p-type semiconductors? Please help.
  2. jcsd
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