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Why do small amounts of impurities have such a large effect in doping semiconductors?

Why do small amounts of impurities have such a large effect in doping semiconductors?
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Why do small amounts of impurities have such a large effect in doping semiconductors?

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User Drmonkeyninja
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Answer Because the band gap is so small for semiconductors, doping with small amounts of impurities can dramatically increase the conductivity of the material
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User Cyberduck
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