The solution to problem 2 refers to a HW#3 solution for the calculation of electric potential as a function of x. (That is because I did the HW #3 solutions first.) At the end of problem 3 you will see the table I am working on. Clearly it needs more entries. Hopefully you get the idea. If not, if anything is unclear, feel free to ask. This works best as a dialogue.
The last upload is of a graph made with "grapher" (Mac OS10....), which refers to the calculation on page 3 (and represents a graph of that for x=0 to x_0). The 16 comes from the ratio of the band displacement energy (deltaE) to kT, and we treat x_0 as 1 (horizontal axis) and think of 1 as 10^17 (cm-3) for the vertical axis.
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