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Suppose I have got two p type silicon materials of different concentrations (the difference in thier concentrations is small but considerable enough that their fermi levels differ by noticeable amounts).Now if I wish to make a junction device using these two p type semiconductors , I would like to know how the built in potential when plotted against length of the junction device looks like ? Also I would like to know is there any general way of finding built in potential from any given band diagram even if it is in terms of energy levels?

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