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I was wondering if anyone could give me a clear answer on why doping a semi conductor raises or lowers the fermi energy depending on n or p type semi conductors. There seem to be a few standard ways of explaining this, some to do with charge conservation or the requirement that the probability of occupation be half, but I havn't found one that seems clear to me, any help on this would be much appreciated.

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# Effect of Doping on Fermi Energy

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