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Homework Help: BJT and graph of charge density over position

  1. Mar 3, 2012 #1
    Say you are given the problem of constructing the charge density vs position graph of a BJT(lets take a NPN BJT under equilibrium conditions for example). Now, it is a given as to how a NPN BJT Energy Band Diagram would look like through intuition or a google search. Using only the information at hand, namely the Energy Band Diagram of the NPN BJT under equilibrium, how do you go about constructing the charge density vs position graph for it?

    And if the above is known how to do, how would you construct the charge density vs. position graph if one would add to the problem that the NPN BJT is actually now under active mode biasing condition?
  2. jcsd
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